Transcript for:
Current Electricity Fundamentals

This chapter has the most derivations. Most derivatives and all derivatives It's not like you have to remember it. you I don't know the reality yet. When the exam comes, How will a small thing come from you? I am asking. At least 100 by yourself You must practice the questions. where is he will you do it with? I was also not someone who Everything was understandable the first time. So So I understand. So you guys Don't worry, don't be afraid. Don't be afraid That you get scared forcefully. ATI has sometimes He told me I should come first. I am not able to understand. I am a donkey. As such Nothing is there A little more depth within 12th is in. But before I teach the depth I told you one thing, starting from the basics. I will go. Before teaching anything in depth I am telling you these basics. forgot I know you are talking about class 11th. You have forgotten brother. No problem. all to you I will get it revised here again. This You already know everything in the lecture. You are going to get the thing. This mobile A thin wire is required for charging. It just falls. And inside that thin wire Imagine what all the things will be like. like this light Because of which you are able to see me. Can you see my beautiful face? You can see the smiling radiant face. The entire thing is burning with a thin wire. light. Are you watching? A light went off. So In this chapter, I will tell you guys I am going to teach. All these things about that thin What is happening inside the wire? That What is happening inside the conductor? So that We are able to understand current electricity. What is the meaning of current? Flow. water flow There is water current. air is blowing Wind current. We can see the flow of such charges. Let us study electric current which is covered in this chapter. We will read inside. Now in this chapter What kind of teachers is Eddie Bhaiya going to teach? What things are you going to teach? So that You don't need to worry about a thing Is. I have already read two chapters to you. Am. Whoever hasn't seen it, go and see it. If you look at the boards in Physics Every child was in bad shape in the boards last year. years know why a lot of children Happened? because they thought physics Any such normal subject that sometimes from somewhere I will read anything. First Second Chapter I did not read it, I sat down after reading the third one. Not the third I sat down after reading the fifth. So in physics Don't miss the sequence in 12th class. If If you haven't read the first, don't read the second. Reading. Finish first first. then seconds Then thirdly, you have to follow this sequence completely. Year to you. So the first and second chapters What did we read inside? potential difference read about. About the charges Read. Using them, we will conclude this chapter. Will read inside. How do those charges work? What happens when those charges are running? You get AC air. you You get air from the fan and air from the cooler Is. If those charges don't work then all this stops. Is. And then everything goes hazy, everything goes hazy Hazy haze. Your heartbeat is also the same It's a kind of electric signal, brother. You Be a circuit yourself while moving around. So everywhere Circuits are everywhere in your life. You will definitely get electricity. Ok? So in this lecture I will tell you People have all the problems related to current electricity. Teaching things in detail from the basics to the details I am going to. You have already read two chapters. You saw it and believed it, right? Still if A child has come to this class for the first time. So there are a lot of things in the minds of those children. There will be doubts. Brother, this is what you will teach me Where can you get beautiful notes made? Us? Don't worry about the notes. You Provided the link to people in the description Will go to PW app. From there you can take notes You can download it. Now some children are the first Bhaiya will come again and tell us about PW app. Don't know about the PW app. We tell you PW You already know physics What a huge education online It is a platform that will help you earn millions of rupees. Providing education to millions of children Used to be. We have produced many toppers. People and the next one might be you. Ok? But if you guys want to be that topper So for that you have to do some things yourself. Will have to do it. In this lecture I I will provide you everything. What do you guys want? Brother, we all Get the derivation done, I will get it done. Brother, me Please tell me all the important questions. Give. What do you guys want? Brother I will get you taught from basic to detail. even one I will not leave anything that will help you in the exam. It will take place in I am not able to understand. When you sit down to write the exam, it will be for you. The lecture will be enough. Questions, Derivations, Are all the derivations important? all Derivation. Ok? Which formula where? I will tell you everything in this lecture. Bus You guys have to do a small work. They I will tell you during the lecture. Attend the lectures carefully and just study. Buddy. That's it. Let's get started. Let's start with Let's start with the chapter. Let's start with electric current. Come on brother. Come on, come on. Look first when you The first chapter in the Electric Current chapter What will you read? Electric current. Its definition is electric current. What do you denote, son? I to Bhaiya I Let's do it from. With whom? I will remember you In class 11th you read the first chapter Something inside Units and Measurement I had studied fundamental quantities. Remember? Is No? One of them is your electric current. Was. forgot. I know you are in class 11th. Things. You have forgotten brother. No problem. I will revise everything for you back here. I will give it to you. In this lecture you will know You are going to get all these things. So first of all electric current. Current Word What does it mean? I said water Current. Water current. What does this mean? Water To flow of I said air current. Wind Current Meaning the flow of air. I said electric Current means flow of charges. But which ones Can charges flow? Which charges flow Could it be that it's free? So the definition right here It will be made from. I always say definition. Don't remember. Have to make it. The Flow of Free Charges. I forgot the rate, sir. Remember the rate too. Is. I told you when mom goes to buy vegetables It is at the shop and she asks what is the rate brother? Vegetable? So rate means dividing by money Are. That's where we rate whenever in physics I will say the word meaning I am getting divided by time. Is. The rate of flow of free charges is Cold current. End. the rate of flow of Electric charges through a conductor. Now He did not suffice a bit Gave definition. Understand the meaning of safestgated yes? After writing this, as soon as you appear in the exam Whatever you write, the examiner's eyes will suddenly open. Will shine. Oh brother, what did the boy It is written in English. This gets extra number Give it to me. Doesn't happen like this. If you line two Even if I write a useful line, you will still You get full marks. If you write like this If you give it then there is no problem. Obviously It is a matter that it flows only through the conductor. Is. Isn't it? So what brother? the rate of flow of free charges through a conductor is called Electric current. Look, it's written here too. You have also written the rate of this. Isn't it? Correct? Now after this you will know, look at this now If I look at the definition What formula made this? Rate means time Divide. Who are you talking about? of charges talk. Has this become a formula? yes no Say. If you look at it from this formula, You will get two units. First Unit Can I say SI unit is What? The SI unit of current is ampere. Remember am p e r e hoga? yes no Say. Ampere or denoted by a capital A I will do it. Look here for Coolam Charge It is cool. So the time is in seconds. Got another unit? Seconds on Coolum. Say yes or no. So write seconds on Coolam whether Write ampere. Remember. Ok? Now from you Sometimes he asks me to do one thing, brother. If the charge is your constant. means 10 Some amount of charge from LETS in seconds It is passing. then in 10 seconds The charge is being passed. then in 10 seconds Same charge is being passed. then it is simple It is the same formula. But if your charge Don't be constant. Be non-uniform. Memory You must have been studying in 11th class. If things were non-uniform Used to do differentiation integration. Isn't it? Aldo, you have done the entire basic work brother. Maths. No problem. So if you Instantaneous current ask what ever ask? Instantaneous current. So what is the formula? Simple what to do? differentiate You are finished. This is yours Instantaneous current of flow. When the charge is Not uniform. Meaning the charge that is flowing He is not a uniform through the conductor. Meaning it is flowing more or less. for then This formula of yours will be useful. these flowers I already wrote it on the previous page. Brother You have got everything in writing. Correct Is? Now you will remember one more thing. When You were studying in my class 10th, right? Pyare Lal and Pyareez Mere Lovely, cute children. One Tell me about when you were studying in class 10th. We already know your memory. It's been a long time since the 10th. 2 years old brother Gone friend. How will you remember things after 2 years? But still let's remember it once. Let us go Let's try. Let's see how much you remember You. So in 10th class you said one thing I had read that the direction of the current Reverse direction of electric current The electron moves. Remember? means if I would say the direction of the current I am a little unwell. Forgive me Brother. If I say here's your one Suppose there is a bulb here. Isn't it? And here We installed the battery. What did you learn from the first and second chapters? Read? Always take yours from high potential Positive charge will move towards the potential. These We have read it. If you accept this Electric field means it is positive. Negative. So your positive charge will always be Where will he go? High Potential to Low Potential. Have you read this? Isn't it? What is the direction of current? by remembering Tell. Is the direction of the current positive? From? Say yes or no. Is this what we call current? Do you call it direction? Is this what we What is the direction of electric current called? Say yes or no. Say yes or no brother. today you You are going to get the answer to something very important. No one will give you the answer to this. You You move ahead. You don't even ask. How many? Did the children think about this question? one time please Please tell me in the comments and in the comments Brother, look, as soon as you get any concept I understand, so you know what I have to write. Isn't it? And brother, whatever the problem You brother, I am sorry for this. yours The lecture came late. I was very unwell For a few days. Isn't it? Aldo, I gave this lecture Recorded long ago. But it is the same Isn't it a sequence? So forgive me. But you Half exam taken care of for people I will go, don't worry. Ok? Let us go. Can you see this happening? Potentially positive. This is what happens, take negative Potential. So the current is positive to negative. This is what I used to read. High Potential to Low Potential. Isn't it? But you may have heard The electron moves in reverse. This is the direction of the electron, son. Sorry. The direction of the electron, son, is it occurs. Remember? direction of electrons What happens? Vomit. in which direction There is electric current, electrons are its It moves in the opposite direction. Why so Sir? Sir, why is it like this? remember what positive charge from high potential to low The potential goes away. Isn't it? the same direction We have called it electric current. Memory Will you keep it? In which direction if I go here If I place a positive charge, it will rotate here. This way. We have adopted this direction as electric The current said. But if I am negative Should I talk about charging, would it go the other way? Is? Low potential to high potential. What You will know this from the first and second chapters. Was there study inside? Is every child in this class? The one who sat in the first and second Have you seen the lecture of the chapter? Tell quickly Two. By the way, I already sent my telegram I will give it to you in your ID in a while. I also share all the notes on my Telegram ID. I do. You guys know me notes This causes a big problem. Sir, get the notes. Go. Isn't it? But you have first and second class Did you see it? See the first and second chapters Did you take it? Son, I am telling you again. Some? Children are the ones who think that We did not complete the first chapter. Second tax Let's take it. We didn't get a second. Let's go third Let's do it. Okay, I would have done the third one first. Am. I'll do seconds later. If you this If you are thinking then in Physics board exam Your condition will worsen and I will not. I don't want the condition of even one child in this class. Be bad. So, I'm telling you the right thing I am telling you. Don't miss the sequence. Previous The children who used to say that board exams Physics is hard, he used to say the same thing Did not pay attention to concepts. Who Children read the sequence backwards and forwards Were. From Chapter One in Physics Class 12th Up to Chapter Six. Until consumption, but no one Don't read the chapters back and forth. First Reading then second then third, then fourth, This way. No missing chapters in between Needed You might not realize it yet will be. But when you reach the end Then you will realize that yes, this is necessary. Is. The child who made this mistake remained silent till the end. Physics will not be able to understand. So if you Second chapter or first chapter yet Didn't watch the video, pause it here. first he Watch the chapter and then come back to this video. Look Ok? Now your AT brother is so When you are speaking, think before you speak. Must have been. Isn't it? come on guys. So this one You will remember this. take a negative charge Potential to high potential goes. Correct Is? That means the electron goes from here to here. Is. So you will remember this. Remembered this Will go. It became easy. Come on brother, come. First point. So the electric current we It is said that from positive to negative. This one Named it conventional current. Meaning we I have accepted it. But the electron that vomits It goes in a direction, it is called Electronic current. We don't read that. Ok? Come on brother next. what about the current Is there direction? Yes sir, it happens. But Current It has nothing to do with direction. Meaning Sir, listen carefully. Tell me one thing after thinking about it. came from here 2 Ampere current. 2 ampere current came from here. Will there be a total of 4 amps here? First Thing. 2 ampere current came from here. came from here too 2 ampere current. Is there a 4 amp here? Will you go? Yes. That means, from where should you get the current? Do not depend from direction to direction remained. There is direction but it depends on the direction does not. Therefore, we call electric current What name did we give it? Scalar quantity. In reality, this is not a scalar current. There is also a third thing called a vector scalar. Tensor. That is not in our syllabus. You will study in graduation. So, whatever Quantity that has direction It should have nothing to do with direction. That We now call quantity a scalar quantity. Let's say. Will you remember? Thereafter, SI I have already told you the unit. already Ampere is there. Ok? Now your class All the memories of 10th class came back to me. Brother, tell me Two. Ok? Look at the small graph brother. A small graph. of charge and time if I I would say that as time goes on, The charge is increasing. Is this graph Do you see the uniform? Uniform? Is this a uniform graph? Uniform Meaning in which a straight line comes. What Is the charge increasing with time? The charge is increasing with time. What Should I find the slope of this line? Slope How Do you take it out? Perpendicular/Base. is this Is it charged and is it time? what slope Is this the charge up time to remove it? Will there be current? Say yes or no. Will this be the current? Say yes or no. That means how much current is there here Is? is q/t. Tell me any problem. You can calculate the current from this graph. The q/t was very easy. In this graph Can I speak? Separate this graph I gave it to you. Give a graph of current and time. Gave. Whose? Of current and time. Straight line. Time increased, current remains the same. Time increased, current same Is. Time increased, current remains the same. Time increased current That's it. The current is not changing. Constant I can call it current. Constant current yes no say. These It will be useful for competitive children. Is there a constant current here? No. There is non-uniform current here. Current Is Changing. Write it here. This is from Chotu There are graphs. Alldo is rarely asked. Correct Is? But you should know. come now Brother. So we will study current in three materials. There are. Not in this class. this class I have to read only one. so one Your conductors are the materials. What are conductors, brother? inside which There are free electrons. Free What is an electron, sir? Assume like this Some of you children are sitting at home. Are. It's time for vacation. Isn't it? and at home Mummy is also there. But mom is very chill. Mummy says, okay son, you go around. Have fun. The holidays are on. what to do Tax. Sir, this doesn't happen like this, sir. you so You are lying. But let's assume it is like this. Is No? Accept it. like in chemistry There are exceptions. This is also an exception value Take. Isn't it? Meaning you get those free electrons Be like. You are sitting idle. in the street Outside came the sound of children playing and jumping. So you immediately run off to play with them. Went. Because you were free. Isn't it? Similarly Conductors are materials that have They have free electrons. Free Electrons mean a little energy and They start walking. And The movement of electrons is called free charge. What do we call walking? Current. i.e. free electrons inside conductors There are. So what is good? Good material that allows electricity to flow Can get it done. Can make the current flow. This talk Did you understand? Ok? Come on brother, this What is an example? One became silver. Correct Is? It's aluminum. basically most of the There are metals. It's aluminum. Aluminium. Ok? And it became copper. Etcetra. Ok? Etcetra. Now come to this. what next Is? Insulators. Electrolysis. Sorry Sorry sorry sorry, there are three types of material. There are. conductors, insulators, Semiconductor. conductors that carry electric current Let's make it flow. Insulators that do not flow Karate, they don't have free electrons Would have been. Semiconductors conduct slightly less current Are. You will read that in Chapter 14, the last. There is a chapter. Now this topic is current in Different. In what materials, how Is there current? So the current is one Because of electrons. Because of whom? Because of electrons. The second current would be It is because of ions. Ayans sir. Sir Ians what Is it so, sir? Hey, have you ever heard of water? Put lemon inside. So squeeze the lemon. Have you heard of lemon or not? Or Then put acid in the water. H positive Cl negative. So these ions also cause current flow. She gets it done. So current flows through ions also. It is possible electrolysis you Must have studied chemistry. We need physics I don't want to read this. or else Occurs in semiconductors. Semiconductors Those who are like you have one Germanium. A silicone one, right? inside these Current flow is also done in two ways. One, they have electrons inside them. Some few. There was an empty space inside them is a hole, an empty hole. This is you in Chapter 14 If you read it, it happens for two reasons. That means one Electric current due to free electrons electrons and free ions from Also because of the empty space. Empty space, sir You will not understand now. No one Chapter 14 I will tell you, remember this. some empty space They also cause current to flow. Sir How will I tell you the meaning of this now? play Attention. Ok? any problem Trouble? This was a simple thing. a small one Let's ask a question about the topic first. Above. So far I've only seen you once Told the formula. Which one? Sir, this one. Have you read another formula? Have you read this one in the first and second chapters? Put this formula in it. Meaning Q Just write N instead of . So what is this formula? Made? i = NEE / T right? Now read the question Are. Whenever any question comes up, The child is not just that the movie is running. Let's solve the question. Eddie Bhaiya He said, we will solve it directly. No son, every child should first answer that question. What to do? Video pause question itself Have to try it from. Then my solution Look a current of 1 milliampere and in What is your first job? You have to write given, son, right? So look, the current is telling you 1 milli. It belongs to Ampere. How much would a milliampere be? Is? Power of 10 -3. Let us go. through a copper Wire? Going through a copper wire. How Many electrons? saying number of Tell me about electrons. will pass a given point In 1 second? He is saying take your time. Seconds. saying give the charge of the electron Gave. There it is. How much is the charge? Hey man, this What is happening? Yes. How much is the charge brother? Here's 1.6 * 10 to the power -19 coulombs. Correct Is? Any problem or trouble? So simple. i = q /t You know the formula. what q's Should I write the place? ne / d now the value of i 10 to the power of -3 n you need to find. e Here is yours and time is your one. Ok? Did this go all the way to Divide? Will you go? Look at it brother. Power of 10 -3 / 1.6 * 10 to the power of 19 = n see -19 raised to the 10 power is 16 Will go. -3 +19 10 to the power 16 when you If you solve it, it will come. So this will cost you 6.25 * 10 to the power 15 something will come maybe 10 Power 15 will come, right 16 15 It is true that yes, 10 to the power will be 15. Calculate it brother Hey, calculation is not hard, why the problem? why are you taking it hard friend A kid came and told me on Instagram Sir, sir, you are very serious, sir. I am serious only in class. Yes, I am serious. When it comes to physics If so, I am serious. Otherwise, you know You liked it, Anurag sir said that. Akshay sir never looks serious. Yes, I can't see it brother. My simple one There is logic. You too can make this happen in your life. Who Your work is something that you It is related to career. always for him Serious. Why be serious for the rest of your life? Have fun, friend. Chill out. tension free Stay. Keep your family members happy too. of the family Sit together and spend time. Isn't it? These forever remember. Ok? Come on brother. Come on Brother. Ohm's Law. Sir why Ohms law sir? Now! Right from Ohm's law. Yes. Teach Ohm's Law You. Why is it needed? Let me tell you. Oms Before the law, I will tell you two-three things Let me tell you. We study electric current. Have already done. Q/T is it okay? do you I have already taught a formula in the second chapter. Am I? V = W / Q. Remember? Oho Potential difference. Isn't it? Did I have a Did you tell me the matter? When the potential difference is Only then will the current flow. Remember this one too The thing i.e. charge will flow. Remember? When There were equipotential surfaces, right? There But work done by charge is zero. Missing you Went? That is, only when there is a potential difference The charge will flow. If the charge flows There will be current. So, if I say somewhere, The potential difference is zero. that means no Current will flow. Can I say this? No electric current Will flow. Tell me any problem. Ok? Difficulty Tell me the problem brother. Correct? Now come forward Are. I told you this. I told you this. Its I told you one more thing later. You. You will remember, you will remember. Oho I remember brother. What else did you tell me? Yes. That's all I said This was related to potential difference. Now You had one more thing in class 10th. Ohm's Law. What was it? Ohm's Law. This is what we are going to read now. from reading this First I will show you a diagram. Very cute. What is that diagram? Look very carefully. This is a building. building. This is a building and this is a small building. Here it is. Ok? This is a building. And here is another building. This is a building. And here is another building. It is three buildings. And here I am What did you put on it? to make a slide Swing type. And a child slips from here It is starting. From here he then here Slipping from. And released it here also. Once again he is slipping from here. So You can see it clearly here It will slide very fast. Slowly here It will slip and it will not slip here. point Is. Isn't it? Now imagine this building and Nothing. This is potential. VA it VB it VA or VP VQ this VC this VD Notice what Here the potential difference is very high VA - VB is very high what potential here The difference is quite high, very high What if the potential difference is too great? The charge will move very fast. Charge fast. It will move from means you are understanding the rate of charge Yes, it is taking very little time, isn't it very fast? Will it flow from will it fall very fast Do you understand the rate of charge, meaning how much charge? If it is coming fast, then what is the electric current It means more, come here, what about here? vp-vq Is not much is not much means not much But the difference is that it will slip slowly. There will be current but it will be slow, hey take the current Whom should I charge to give it to? I will not charge it. If it is running then the current is zero, should I say the charge is very high? Running fast means the current is very high I am telling you the charging is going very slowly Meaning the current will be less, this means now he will reduce the current by this To relate. Come here. what here There is no potential difference. It is zero. Isn't it slipping at all? means charging is running It is no more. When charging is not working Is the electric current zero? So this One thing I understood from the diagram is that the more The greater the potential difference, the greater Current. Who told this? Om Baba. It States that the current flowing in a conductor. Look, you can even create your own definition of it. Are. Om Baba said George Simon Om Inka The full name was. What was his name? George Simon Om this isn't Simon from Simon Go Back Brother Simon, not that one, Simon go back. No, this is not that one, this was a Baba Om He is Baba, he has done very hard penance. After all, where are these mountains actually? I was in the mountains of Himachal, I came fine When he came to visit, he was doing penance. At that time they felt a jolt and the jolt was like As soon as they felt it, they immediately knew it. I have to give this theory to everyone. Ok. Hey, true story, I am joking. Some children will say really, sir, really. This happened. Om Baba had really come to the mountains. Pay. It is not like that brother. It's a little joke Buddy. While studying, I talk to you in between Let's take small ones. So look brother Don't make a definition. what did I teach You? Never have to remember the definition. I have to learn to make definitions. So it states What does that say? The Current Flowing through a conductor is directly proportional To the potential difference. That is, the current which flowing through a conductor, that much The more the potential difference increases, the more you You will increase it. This is Ohm's Law. Now one thing about this He added an extra. some things Keeping physical quantities constant. Which physical quantity? like neither Let's say you are a conductor. You have it. Here it is. They are saying that this conductor has no length. You will increase it. Isn't it? Nor will you increase its area, You will not decrease it nor will you change its temperature. Will you do it? Meaning its physical quantities and temperature Oms only till there is no increase or decrease in anything The law will be valid. So what did Ohms law mean brother? Ohms law came I proportional to v. it like this can also be written as V proportional to I what Can you write? V proportional to I okay? What was this? I proportional to V we like this You can also write. So now here As soon as proportional is removed, constant comes. What did they name him? R this R Will you tell me what happens? Here it is i VRI Whatever Vrai is. VIR Write it like this also whether. V = IR right? First check if there is any problem. Now What did he say? Do not raise the temperature Increase. There should be no temperature change. Length should not change, area should change Should not happen. until you get these things Ohm's Law is until you change it. Valid. Ok? And until then this resistance What will happen? Constant. Till then this What will be the resistance? Constant. What is resistance, sir? Let me tell you. Normally, assume that you have a friend in the street. The rally is going on brother. You are your street I stood in my balcony. See You are going down to the rally and people are going to the rally They are shouting. yes yes yes yes Yes yes yes yes apply force Isha apply force that such people are going brother, so such people If you go to a rally, there is a huge crowd. People are lightly bumping into each other While walking, we collide and move away from here. Colliding with this, oh light collision This is what is called a conflict, meaning an obstruction. Resistance so what is this R R this is R Resistance is present in every conductor. It happens, why does it happen? who were conductors It's like your wire. Conductor means Wire. So there are a lot of freebies inside them. There are electrons. Isn't it? and atoms Also happen. There are other atoms also. So These electrons collide with each other. Atoms collide with. So what comes from that collision? Is? barrier. So we call this obstruction There is resistance. Ok? Now this obstacle Normally every conductor has some Very. But if you raise the temperature, You will reduce it. How to listen carefully. Now the same Imagine the rally. One of the rear in that rally There were dogs in the house. one in their house I was a naughty child like you. He home opened the gate and told the dogs to Touch. Ush ush Lalo ush, I said this. So Dog brother, you know it very well. dogs Came out of the house and the dogs were absolutely fierce Those. So he broke into the rally barking. Fell. Watching the rally, dogs are coming behind Terrifying. Two or three dogs. so brother rally mad It has come. People suddenly started running here and there in the rally. Started. People thought out of fear that these people As soon as they entered the houses, they started running here and there. There was already a crowd at the rally. when afraid If they ran here and there, they would collide with each other more. If there were more collisions, the obstruction increased. More obstruction increased. think about this Electrons started colliding with each other more. Will the wire get hot? Oh, more Collision means friction. Isn't it? So what now? You can definitely increase the potential difference. But There is more conflict, more disruption. If it is happening then the current cannot increase that much. So This law fails then. That is, when will this law Is it valid till? As long as you keep the temperature You will keep it constant. Not even the same length You will increase it, but you will not increase the area also. I will tell you What effect do these have? This is it Your Ohms Law. What will you remember? Simple graph of Ohm's law. If I speak This V, this I, is V proportional to I? So Will this graph become simple? This line which What slope will this give? Is this slope Will you give resistance? Say yes or no. sloop What is the formula for finding it, brother? it It is normal. What will this bring you? What DeltaV will it come to? Delta. So what is this Have you arrived? DeltaV/ Delta. And what would have been this There is resistance. Then the slope of the V and I graph What will he give you? Resistance. You will remember. Now if I reverse the graph Should I give it? Well, I'll give you a chance to write to me. I am giving it to you, my friends. Friends We are giving you a chance to write. Give Are you there? Well, I'm not forcing it I will speak. Look at it brother. Evening is like a river flowing like waves Has been. This is very wrong, friend. Nowadays There is a lot of water flowing. There's flood everywhere you look Is. There is a flood here. There is a flood there. This world See. There is only flood in this world. We think I was going for a walk. Then we get sick Went. Then we thought, forget it, the flood is so severe. She has come. Those people whose brothers are at that place Just think what they must be going through. Really, friend. This time it rained a little more It is coming, right? It is coming to your place too. Where are you from? Tell me friend. I want to know you, to recognize you I want. embrace your problems I want to and then solve those problems too I want to do it. So tell me in the comments You guys do it. Ok? that sir this The problem is ongoing, this problem is ongoing. Isn't it? And also tell me whether How did you like the lecture? Ok? of you people For I do. Now, of course, I'm feeling unwell today. It's bad. You can see it on my face today Must have been. The one on your face is your heel Brother's shine is always there, but perhaps it is not there today. I was coming to record the lecture, right? I came out and asked if my face was okay. It is visible. So sir, I am feeling dull. So I then washed my face two or three times and Brother, if our face looks dull then our children will get hurt. It should not happen that sir we are not watching. So For you brother, then I thought, come on, friend. Meaning it was necessary to record because It is important for you to attend your lecture. Ok? Let's make this thing clear. Now if you assume Let me reverse this graph. Whom? Let's reverse the graph. This graph It was such that V was on top and I was on the bottom. Isn't it? If Let me turn this upside down. Let me do it here. Let me do V here. See if If VI is a graph, what does it give? Resistance. What does this give? Resistance. If I turn this graph upside down, what will it be? Will you give it to me? This will give 1 / resistance. Memory What will this line 1 / r give? Reverse The opposite of resistance. Meaning, if this one Let me talk about the graph, look at V and I This graph is one this and one this. I to you Should I ask you, tell me which one has more resistance? So The line that is higher is the larger one. Line means the slope which is greater Resistance is high. Meaning this one The resistance will be higher for R1 and lower for R2. will be. Correct? R1 will be greater than R2. But in this inverted graph, the opposite happens. Will go. Suppose this graph is like this. Here But I here V and in this graph which is above Suppose the line will be R1 or R2, now which one Resistance less or more. Now it will subside Because this graph is inverted. Now R2 is bigger will be from R1. You will remember this. This small The thing is. This is why the question comes in the exam. I told you. Ok. Let's ask one more small question. I will give it to you. Let's say a small one but a fat one Let's ask questions. No, let's go with this one. Come first. Resistance already you I have already told you what happens? resistance Sorry for the interruption. resistance Basically hindrance. Hindrance means obstruction. Who creates the obstruction? Inside the conductor electrons collide with each other Are. Electrons collide with atoms. So Basically, the conductor himself is a is causing obstruction. crowded inside He has. Are? He has created a crowd inside. Isn't it? So consider that obstacle as Our friend got married. our friend's I am married brother. So what did she do at the wedding? Did? Place booked Banquet hall booked He did what he booked at the wedding venue. Instead of 300 people, 1000 people were called. So Inside they are bumping into each other while eating. One Tikki is eating each other's cheeks I am going to. Are? So those who then People are fighting, clashing. So why Are you colliding? Because of whom are you colliding? Who made that arrangement. Isn't it? So beans The electrons inside the conductor interact with each other Whose fault is it that they are colliding? conductor It is my fault brother. Are? So this electrons that are colliding because of Are you colliding? Colliding because of the conductor Are. So this is what they call hindrance. offers The Opposition Opposition. Opposition a material Offers to the flow of electric current. The Opposition. Opposition means obstruction. A material. Material means that conductor. offers that provide is to the flow of electric current. to this very We call it resistance. what is the SI unit Are you watching? Om. OHM Either write OHM or Then this symbol, the name of this symbol is Omega. What is the name? O M E G A. OK man. Any trouble for a child Tell the students, son. Let's go now Let's read some things in it. Think and tell me. Remember that rally thing. which is in the street The rally was going on. Assume your street is very It is far away. It is a very long street. what obstruction Will it be for a long time? They will clash for a long time. That is, the greater the obstruction, the more Length. Say yes or no. correct. Second Your street is very narrow. very narrow street Is. So people crowded together even more. Will collide. Thin means less area. So the obstruction The more the area the less. So from here A came r proportional to l / a resistance is directly proportional to l inversely To a and from here came a formula. as soon as You will remove the proportional and what will come again? Is? Constant. Again there comes a constant. What will these constants tell you now? Look at this First. Look at this formula. Constant K Let us tell you about it. So you know all this in 10th I was complete. or else bring me here Was not there. A little more in depth within 12th Is. But before I taught Depth, I I told you one thing, starting from the basics. I will go. Before teaching anything in depth I am telling you these basics. Then I will tell you something in depth. So You will understand it very easily. You will enjoy it. Let's see. This is the symbol This symbol is called beta resistivity. What do you say? Resistivity. This which It was a symbol, what do you call it? Resistivity. Like your DNA. You can tell by plucking one of your hairs Isn't that how old you were? Oh yes. Sorry, how old are you? Are? Your What disease does he have? Everything can be told Is. As if here is a conductor. Here's a conductor. If I only say this small place this specific place It is a special place. I will tell this Specific. of this specific place Tell me the resistance. specific resistance Tell. Now tell me about this little place. What is the resistance along the entire length of this wire? Will it make a difference? No. If I assume the wire Let me make it thin. Tell me what difference did it make? No. If I make this wire thinner. What difference did it make to this small place? No. Meaning the wire is thin, long, thick, short, small, whatever This small place doesn't matter Will have to. Is this small space enough for the entire wire? Will you tell me the situation? This specific resistance Will tell you about the entire wire. Yes to this They gave it a different name: resistivity. What name did you give? Resistivity. The Resistivity of substance is defined. The Resistance offered by a wire of that Substance. resistance to that substance How much? Of 1 meter length. short length and Small area. This is what you call What? Resistivity. What is its SI unit? Is? Ohm meter. See the formula? This was the formula of resistance. So its What will be the formula? But you will remember one thing that neither of these It has nothing to do with length or area. Its One thing has to do with temperature. Complete Should I change the temperature of the wire? this place This will also change. Replace the entire wire Two. Still, the change will happen. i.e. on the wire It will depend on which wire it is? And It will depend on the temperature. this is yours Resistivity. Easy. Now leveling up Am. Now taking things to class 12th level I am leaving. Before that, a small crocodile They ask fat questions. Ok? Say Negligibly small current is passed through A. Wire. Gave the length of one wire as 15 meters. Ok? Saying end uniform cross section. Area given 6 * 10 to the power -7 m² And its resistance is to be measured. Gave resistance. 5 Om What is the Resistivity of the material saying at the temperature of the Experiment is saying temperature is fixed I have kept it, tell me brother, tell me quickly, listen carefully. Tell all the children the answer to this quickly. We will apply the formula All Hindustani ok tell me the resistivity should I keep it Doon R.L. ral ra / l let r how much do you put five a how much is 6 * 10 to the power of -7 l how much is 15 5 * 3 = 15 3 * 2 = 6 2 * 10 ^ -7 what unit Should I apply it? Yes, no, tell me if you enjoyed it brother. Quick Look quickly. Hey look, look, what is that Is there a tree? Next question. Let's go, this one I have already asked the question. What Vi Graph will this tell you the resistance? Resistance yes no say. Keep writing quickly. Does this question come in your boards? Will this tell 1/R of resistance? Reverse. So in this graph, whose should I say Resistance high? RA or RB? So what Will you tell me directly? RA is greater than RB? Say yes or no. I have already told you this, same thing Question. Look brother, there is no problem. Tell. Come to one more thing. current density What happens? Density. Sir Density Sir Ye So I studied in class 9th, sir. in the ninth I had studied density. Hey, what would the density be? Is? Like right now my density is very low. We He has become very thin after falling ill. Brother If you notice, look at our hands. Look brother, yes I have become very thin brother Our birthday is coming, our birthday too It is about to come and we have become thin brother Our density means the bigger the body The mass that was inside me earlier is now less. We have dried up, our density has reduced so much. This is what is called how much stuff is in a place Density is how much stuff can be packed into a given space. That is what is called density, right? But current density means how much in how much space It is current, that is, current divided by area This is what I told you about how much current in how much space. What does current density say? Current density Did you enjoy it, tell me, did you enjoy it? Yes, now the current Density Remember a vector quantity and also area Vector between two vector quantities Multiplied and the answer came out to be scalar. This is called the dot product, so its full The current is ja and cos theta is applied along with it. This is what current density gives. Current Flowing Any cross section through unit area is Cold current density. Had fun. Tell me brother. Hey, tell me quickly, say it quickly. Ahead Then they move forward quickly and swiftly. come on guys. Ok? Now look, look carefully. Attention Look from. Look carefully. Look now at one of the best Important: The most important thing in this chapter Derivation is the most important topic now. It has come before your eyes. Correct Is? So you are a servant of God. on you Whose emphasis? Let's start reading. by applying Full force. What is mean free path? Pisces Free path. You probably studied chemistry. It might be there but I know you might have forgotten. Something No. We are sitting here, your IT brother Why are you taking the trouble? Imagine it. A plate in your hand. you play it Brother is no more. Yes. neither is there anything in it You are going to ask for it. In that plate you Many, as if many marbles were kept Are. Marbles. You know marbles. And Shake them like this randomly. so like this Each of your molecules is like a pen. Is. Its molecules are also like this They are vibrating. But you don't see are. On a very microscopic level, if I Let me talk to Sam, who is your conductor. Remained the conductor. sitting inside this conductor Electrons also keep running here and there Do you know? without you connecting it to the battery When you connect it to the battery electrons moving in one direction I will start it. Butt without battery You have also connected your conductors the free electrons that are inside them They keep running here and there randomly. here and here here here someone half here half here half here half half here, half here, half here, half here, half anywhere This random motion lives in random motion Would this be random motion in random motion? Basically, if a little of any substance There is a little bit of temperature, there is a little bit of Temperature itself means molecules You must have read about vibration in chemistry. You and I are seeing that it was there in 11th also, right? That is, if even the slightest hint of something If there is temperature then its particles move here and there Keep making motions. Isn't it? This random motion Their velocity is called are the thermal velocities. Thermal because of heat Because of. So what happens? which is your There are conductors, suppose there is one conductor. What is? A conductor. The value in this conductor Look, there are a lot of electrons sitting there. There are a lot of electrons sitting around. Isn't it? So what do these electrons do? random Keep making motions. such such such such They keep roaming around like this. This way. But They move in such a way that if you suppose velocity of one here velocity vector here So the second velocity vector is just opposite. The vectors keep canceling each other out Is. So net thermal velocity if I say Net velocity is their net thermal velocity Zero is calculated. Meaning if the value Look, if the velocity is 10 here, then it is 10 here. Will happen. then the velocity vector of each other They keep cancelling out. so until then There is no current. There is no current here He will kill you. Isn't it? You will touch and see Then you will not get electric shock. Because the net velocity We made it zero. Did you understand the point? Here There is one thing written on it, meaning free path. Its I understand the meaning. First understand this basic thing I came to everyone. This concept actually You also have another chemistry class. He is also from 11th. But I said it again So that no one remains confused. this is Understand. Average thermal velocity without Given potential difference, without battery It is zero. Ok? Now let's understand Mean Free What is PATH? Now suppose you have battery Connected it. What did you tell a conductor? Did? Connected to the battery. With whom? From the battery. As soon as you connect the battery Did it, positive here, negative here, so all all the electrons start running here Will give. Now all the electrons I will start running here. Do you believe it? One Earlier I was running here and there in direction. Now we will run here. But as soon as I ran away I will start running immediately. Force will be applied Not one. An electric field was formed here. Positive to negative. This electric field Because of this, a force was applied on the electron. When force is applied, acceleration will occur. as soon as Force is applied on the electron. electron walk in one direction Start. As it goes. They collide somewhere else. from an atom or collide with another electron. Hey brother, bump into Went. Then we walked again and collided again. collide collide Collided. Meaning, if force is applied, move fast immediately. But they collided. ran as fast as Time was wasted in colliding. then faster Ran and then collided. Then they ran fast and then collided. So that is why we do not say that electrons move Have been. Do we know what we say? Electrons actually move. That is why it is called electron drift. Does. That's why the concept will drift Velocity. So electrons basically move is not inside the conductor. We say no Flow of electrons. That doesn't flow. That drift happens. slip away In Electron Actual. go and collide We kept colliding. So what is this about you? Mean Free Path. It is saying that a electron Suppose an electron moves and Collided. So how much time will he spend between collisions? walked? How much did he walk between collisions? This It is called free path. The Average Distance Transverse. Transverse means walking. By N Electron during successive cogenerations. Say which is repeatedly hitting collagen which How much is going on between them? I took his average and told him Mean Free Path will remember relaxation time what is it when he's walking suppose from here If it ran and hit here, how long did it last? The poor guy was relaxed for so long that he collided. No, this is called relaxation time. Time between two consecutive collisions one two How much time has passed between collisions? of electrons in conductor when current is This is called flowing through it. Relaxation time, you will remember this from Tau We denote this. From this symbol Denotes relaxation time. Relaxation time. Please forgive me brother We cough. okay brother. Yes. Will try. This is actually a cough It will not reach you. This is it by the way It spreads. But you are so far away from this It will not be able to go through the mic. Isn't it? And if you are holy souls. you are true If there are people, it will not happen at all. and health Take care. You guys are also my friends. Isn't it? The weather is going like this. Yes. Come on brother, here I understood the point. Move ahead. Now today which The name of the topic we are going to study is Drift velocity. We will get its derivation done. The most important formula is this chapter Of. Its derivation is very important. I will teach you now. Why are you taking the trouble? Tau. Ok? What are you saying? Drift Velocity is defined as the average velocity with which the free electrons get Drifted. He is saying that free There are electrons, the average of all of them Find the velocity. those who are slipping away the velocity from which the average velocity is What name did we give it? Drift velocity. Let's get the derivation done. you will enjoy it Now. So for the sake of derivation, suppose there r number of electrons whose random are thermal velocities. suppose one Velocity U1 vector of the electron. Others of u2 vectors are the third of u3 vectors. One Such cash test lots of velocity. Very If you have all the electrons, then there are many Velocity. of the first electron and of the second This is for the third, this is for the fourth, this is for five. Ok? As soon as you plug in the battery, the velocity The change has happened. Now let its velocity be v1 It's done. The final would have been the final, not the first one. Initial second one final one. Second Done v2 The third one is v3 and dash dash what about these Did acceleration happen? It happened, say yes or no. These How long did it last? time t1 how long How long did it last? Time t2 How long did it last? Time t3. Correct? vu and acceleration a Vector. Everyone's acceleration is the same. Isn't it? Have you seen Newton Baba's first Remember the equations of motion? v = u + at first I can write for the electron having v = u + at v = u + at Dash dash dash dash say yes no. just like that n is the number of electrons. how many n numbers There are n electrons. So what about the last one? of vn = un + a vector tn yes no say say Quickly add the equations here. here also Add it. Add everyone. Add it brother Everyone. Add it brother. Add it. add everyone Two. do it. So add v1 + v2 + all of these. v1 + v2 + dash dash dash dash vn , u1 u2 unu u1 + u2 + dash dash dash dash + un Ok? Add this. , at1 + at2 + Dash Dash Dash Dash Look at it. Do this much first. What to do now? Divide both sides by the number n. Oho You want to find the average, right? good average What is the method of withdrawal? sum of Digits upon number of digits. If I In this equation, the average of this, this and that I want to find out whether I can divide by n below Should I give? Let's do the first step. to this a Take the common one from everyone. Get clear? Come on brother. 1 2 3 and go. This is very funny. v1 vector + v2 vector vn vector equal to U1 vector, U2 vector, What did the UN take from everyone? a common a vector. What's left inside? t1 + t2 + t and What did you do? Divide the entire equation by n Did it. Divide this also by n. from n Divided it. Divided by n. could do Am? I can do it. of the entire equation by n Divide Curry. divide n into two parts Gave. Well, one Babu is written somewhere 2+ 3/2, right? Can I write it like this? 2 + 3 Hey, I can write two separately too, right? This is a small maths thing, okay. Look, is this the average thermal velocity? Yes, no, tell me is this average? is the thermal velocity Tell me the average thermal velocity is before Applying Potential difference yes no say battery Is it zero? Say yes or no. What This is the average time between their collisions. Or is this the relaxation time? yes no Say. Is this drift velocity? This We have called it drift velocity. I enjoyed the derivation. Hey Velocities! The average is called drift velocity. Are. Denote it by vd. is this Has it become zero? Acceleration vector. Is this the average time? Is? What is this? This is your average It's time. Is this called relaxation? Time? Say yes or no. Is this what Do you call it relaxation time? Tau. clear? This is what is called Tau. told It was just a while ago. Let's talk so much clear. Say yes or no. So your drift Velocity's formula for children has arrived Vector * Relaxation Time. But is this what Is it swollen? No. It's not just this. thinking about See what else will happen? What else will happen? What else will be? what is the formula for acceleration Can it? Force / m think about it. also v No Acceleration should be Force/Mass. And the force is q * e And q here is your electron. Yes Don't say it. hey what's your acceleration Came? Look finally. Acceleration came Yours truly /m what q is your electron then -e Because the electrons are moving in the opposite direction goes. What is this minus telling you? The electron is moving opposite in the Electric opposite direction of Electric field. what about acceleration Has this value arrived? Put it here. So look What is the final formula? vd means drift velocity equals to e to the minus / m and also what tau tau means Relaxation time. So if you write the vector form, then write this Is. If I remove the vector from both, then this Remove the minus because this minus The direction is telling. what drift Derivation of velocity now tell me in the comments Every child will tell me, brother. It is our own fault. If you understand the first turn Sir, I am a Bhokaal. ATB Write Give. Yes Akash Sir talked about the union of the soul with God. I had got it done, right? We will make our own Bhokaal. Brother, whoever's brother became a Bhokaal, whoever He did it in the first attempt, will he write it? ATB Okay, I have to tell Akash Sir about the soul. We are yet to meet God. It's time to let us live, okay, tell them Now we have to prove our mettle. ATB is fine in the world right now, come on brother. Everyone has written it now, write drift velocity. I took it, say yes, yes no, everyone understood. Speak quickly, oh speak quickly, let's move on Tell me, let's hurry up, okay, now come to this thing. Topic Mobility These are two or three topics, after these there will be another one. A good question will come, a question will come This has been asked many times in the boards, brother. I will tell you now, I told you in class brother All the important questions in the boards I've asked you many times, they'll get it done for you. You know I am with you for the last time I will not leave it till last year also He did not leave his children till the end and I always used to tell them that children should memorize things. Don't Pay attention to the concept. Definitely do the derivation. in last year's paper There was not much derivation. Butt Derivation Gin Children made their concepts strong went and asked questions for those kids It became easy. Ok? Let's talk about mobility It happens? What does mobility basically mean? Is? If I say someone is very good I am able to exercise. his hands and feet They are turning very well. Meaning this is a Bar uncle, are you understanding the meaning? The flexibility is very high. Flexibility means this person's Mobility is high. Mobility means that It is about who is able to move around more. So the mobility is basically of electrons What will be the mobility? of electron How high is the velocity? How much How much should be consumed when an electric field is applied How much can you run? yours Mobility. How much electric field should be applied? But what is the speed of the electron? So what Is there speed? So the symbol of mobility is drift. Velocity / Electric Field. Drift What is the formula for velocity? e tau / m is this what drift velocity is Formula? There's already an E written in it. One. Cut E out from e. So here comes E tau / M So there are two formulas for drift velocity. It's your choice which of the two you choose Do you want to use it? How will its unit come? Brother? Velocity is measured in meters per second. Electrons are the result of its electric field. What is a volt second? Volt Bhaiya Volt, hey look brother, there is a meter on volts. Is. Voltage down meter up then I meter square / volt second meter square Volt second. Write VS for volt second. Elder brother. Now a question that appears on the boards It has been asked many times. Here it is. Drive a Relationship between drift velocity and Electric current. I asked the formula many times. Has gone. This derivation has been asked so many times. I also got this derivation directed to you. She goes many times. Ok? Let us go. understand Are. I will make a small diagram. But It's before this, right? You have to look very carefully, right? Look, this is positive, this is negative, okay. Write down the voltage V here. Is it positive here? The negative electric field will come here. The electric field is fine, which The electrons are here, they'll run away. Run brother, run here, drift velocity I have one thing to say about Drift Velocity. Think about it and tell me I'm a very good drifter These electrons with velocity went here. I I'm saying I went from here to here Electrons. Very small distance. Very A short distance. Went from here to here. go here It took very little time. very small Time. Tell me about the current of very short delay To the current for very short periods of time. Shall I write? dq / dt Yes No Say. What should I write? Look at one thing very Look carefully, brother. In this derivation I Drift Velocity and Electric Current I want to show the relation of. Drift Velocity, now you understand one thing, right? If it happens within the drift velocity then it acceleration of electrons but the time If it gets wasted then that much benefit is obtained If not, it moves very slowly. Let me understand this much, first tell me this much Brother, please look at the sign quickly. Okay, now I'm going to write you something. I am what you should always remember also Let's write this later, first write we know That it is necessary to write calculate we know that Tell me what is this? This is called electron density. We know That electron density. electron Density means electron density Meaning, how many electrons are placed in how many spaces Are? number of electrons per unit Volume. Volume means space. In how many places How many electrons are sitting? what here Than I can write? Number of electrons came your n = volume. What? Can I write n = volume? I Area * Length Yes No Tell me what I can write the volume as area * length Make this the first equation, shall I? I can write the volume as this area and this Length Yes No Say Am I writing the volume here on the side? I can write down the formula volume area into length First of all I calculated the number of electrons. Find out this is the total number of electrons. You understand so much that someone has a problem, Tell me quickly about any problem or any sorrow or dilemma. Speak fast. O dear Ok. come now. When you find out n Given number of electrons. are you total Can you remove the charge? also q equals to ne. what would be the charge is the number of electrons * of electrons Charge? Say yes or no. do you know Is? Can you write this instead of n l And this was already e drain. Remember this too Easy to do is drain. did you even charge Took it out? The charge was also withdrawn. See You got the number of electrons. Then you got the charge drain. Now what Do you know the formula for current? What There is current dq / dt 1 / This is what happens. Now put instead of q Do it drain. I am doing it on the next page brother. Let's do 1 2 3 and go. Then i = dq / dt and q What should I write in place? n Drain. Is n also a constant area? Constant. e is also the charge of the electron Constant. Sir, l is also a constant. This l Do you know what it is? I know what this is Is? How much distance is the electron covering? Is? How much distance to walk? This is basically the entire length of this entire this entire not the length Is. Remove this. Yes, sorry, this is the whole There is no length. This is what the electron The distance is being covered. this is the length It is being talked about. So if I do this dl / dt What lengths the electrons cover while moving doing. Are? That drift velocity That's what the base is doing. He is walking. It is called drift velocity. So this What is the difference of length dl / dt Are you feeling like this? dx / dt like something. Hey Differentiation of Distance Upon time. Is this velocity? This only So is velocity. n Which velocity? Drift velocity. So write it correctly. Write V. Then E na here is the current Formula in relation to drift velocity. What? v no. So see how you remember the sequence. Have to keep it. First you need a capital N to be located. That is, number of electrons. Number of electrons found then charge You can find it. Charge received then current You can find it. Remember the sequence like this. How many children enjoyed it, how many as much as me Okay, let me tell you one thing, kids. I always say this in every lecture then I am speaking from what has happened so far in this lecture It is fixed, I know that the one reading it He is a child because he is not a reader Initially, it disappears after a while. So if you have survived till now then you are mine Dear sir, the girls are saying you are red Not always with boys, son you are lovely So my dear and my dear Lalas comment I must tell you that Sir, yes we are ticking. Yes, and we will finish this lecture only after completing it. I will take my breath and burst half and half in school Will come. Write it quickly. Then I I will also give you my Telegram page. Brother. Isn't it? Telegram page also had to be given Nor to you people. Write this down, brother. after this Write this. And which children will get this first? Did you understand in turn? Sir, we are that lovely red There are those who understood this the first time. Is it okay son? Let us go Let's do it further. What do we do next? you I had told you this. Look, look, pay attention Look from. any child, any To a student, to someone I love, If someone my dear son does not have notes I met someone from the first or second chapter and that If you are troubled then here is the solution to your problem Son, scan this barcode. Our You can join us on our Telegram group. I will catch you there. Don't worry. Ok? Let's move on. So look now brother We ask questions. Look at the topic It is also important to question who should do it. Come along brother. well you know There is still a lot left in this chapter. Electric sail left, Wheat Stone Bridge All that remains is Kitcheff's Law. There's still a lot left Yes brother. Isn't it? But I am in this sequence I am teaching you that you don't need everything at once. I should raise it in small levels. So that You understood things very easily. Look, till now we have given you electric Current taught = Q / T The formula for Q is NEE Simple. What did we do directly after this? Brother? Drift velocity by mean. Drift I saw you before Velocity Relaxation time taught. Isn't it? So Drift Velocity is the best yet to be seen The important topic remains the same. So he has a lot Perform the derivation two or three times. whose first Please do tell me what happened in your turn. Comment In this video. Ok? say the question asking the drift speed of electrons Used to be. When did you give how much current? Current Given I = 1.5 ampere. Current flow Copper wire cross section area given 5 mm Square. See the figure in millimeters Is. So do it in meters first. 1 millimeter There are 10 to the power-3 meters. So How much is it in square millimeters? 10's Power will be -6 meter square. of the meter It is square. 1 mm happens in 10's Power-3. 10's in a millimeter square Remember the power of 6. o gave it is v Velocity given v drift velocity How much is he saying v will have to find this Actually, he is also saying that he will find it if The electron density That small one n * power of 10 gave 28, see Look, it's not on the meter. Telling the value of v in millimeters If you want to tell in seconds then first find the meter. But I'll do it in a second, so let's The formula will be I = v na That's it. How much is 1.5? V has to be removed. How much? 1.6 * 10 to the power -19 do one thing. Let V stay here. I / E na Bring this. So V has to be found. I yours 1.5 E yours 1.6 * 10 to the power -19 N yours 9 * 10 to the power 28 A yours How much is it brother? That's 5 * 10 to the power -6. Look at it. If there is any problem, trouble. Now Let's do some clever calculations. 28 -19 + -6 - 25 28 left 10 to the power of 3 left, right? So this is cut off, this is cut off, 10 to the power of 3 Will be saved. I will do it on the next page. 1.5 1.6 / 9 * 5 right? This power cut, this power cut 10 Power of 3 left. Ok? Look at it brother. these decimals to these Decimals over. Ok? 5 * 3 = 15 3 * 3 = 9 16 * 3 = 48 This gives 1/48 and the power of 10 If I move three up, this will be created. Your 10 to the power of 3 means this is Your 10 to the power of -3 will go here. Let 10 to the power of 3 10 to the power of 3 If I remove 3 to the power of 10, it becomes millimeters. It will go away directly if I remove it. Directly this is what is being made into a millimeter. Millimeter to the power of 10. See 1 millimeter meter. There are 10 to the power of -3 meters. So 1 meter in reverse is 10 to the power of 3. millimeters. So If I remove this, it will become a millimeter. Direct. So v is your 1/48. mm Seconds. meter to second place millimeter second. If you divide it It will come to about 0.02. I enjoyed the question. Here it is. 1 2 3 end Go. Ok? Look, I have given the solution here. Has given. 0.02. mm But the second is coming. Is it okay son? Let's move on. Resistance and resistivity. you are thinking Sir, there will be resistance in 10th Resiliency was taught, that is what you read here. I gave it to you sir. Sir, there is nothing different in 11th and 12th. What? It is different. We are here to look at the microscopic Read at the level. Microscopic means Let me tell you. Let me tell you what I I have taught three formulas? these three I will show you some magic with formulas. Ok? First of all, what is the first formula? I , V E NA right? I already know about v Formula. Do you have the formula for this? Already know? Put it on. Its What was the formula? Remember. e tau / m Was this it? Everything else should remain as written Two. e na let's go. Now look carefully. What You know the formula for this too. Its e = v / l see. I am all that I give you I will already tell you the things that I already know. Write down everything else. See. e such Let it be. Uncle, let it be like this. e na such Let it be. And let the bottom m remain like this. What did I do? instead of this v instead of e What did you write? Is V/L okay? Now just look What changes are taking place here? What came? What came? What came? What came? be careful See. Something came up. You must be getting something. n² Look, I will tell you what you get. You have read a formula. If you If you have forgotten, I will remind you. I will tell you now. e proportional to V read Is it all there? did you read this formula Happened? This was called Ohm's Law. if you If you remember, look quickly at E proportional to V Make a note of it first as well. along with Keep taking notes brother. Tell me E no sorry I You have read Proportional to V. It looks something like this. I is there, V is there too. I Here it is V Here it is. That means all of these Make it constant. That's what he wants to say Question. Okay, tell me one thing. proportional By removing , constant comes. So constant Remove and return proportional. That is, as much as Let's imagine the rest of the things. Come on, it is No? What is I equal to here? V just like that Leave it. Look at the rest. NEE² Tau NEE² Tau A Divide in M ​​/ ML That's it. Just look at it. If I think about it I should make everyone constant. What I Proportional V coming? Ohms law is proven Went. Is this what Om Baba said that you By keeping area, length, and temperature constant Two. So I proportional V comes. Ohm's Law It has been proved. Are you watching? This to you I don't know how to do it. I am showing you this Yes, it's magic how things come out. Aldo, we didn't have to do this. Ok? Now Tell me just one thing. Look very carefully. That means I came here V Let it remain written like this. what else is left Our? N² * E² N² What's in A Upon? m * l Look very carefully. Isn't it? Come on brother. Now! Till then tell me any problem or trouble brother. I will tell you the formula of resistance. Let us go I will tell you. Don't do anything. Do one thing from here. You Find out whose value. From here V's You guys find out the value. Only V's Find the value. Find the value of V. Give it to me, what will I get? Only the value of V Take it out. From here. Whose? The value of v. Brother Or the value of V. Take it out quickly. hey hurry up Take it out brother. Take it out quickly. Remove the V's Value. Will v come from here I m * l / ne² tau * a this will come, this will come, tell me quickly hey Speak quickly, say quickly what v equals Two happens I * R happens V here it is V this Here it is, here it is, so this R is should be equal to the rest should not be It should be so tell me this r. Compare What is the remaining value after doing this i.e. m * l / ne² tau * a should this be r? Resistance. Now basically you are told that this Remember this. I would not say. I am not I will speak. Everybody does the same thing again Let's see what I did. Look what I Did. I knew three formulas. v na Instead of velocity, e tau / m was written. V/ L voltage instead of electric field Length written. Isn't it? what have I done now? it Saw the formula. V written separately. everything else I wrote it down anyway. Then what did I do? V's The value was taken out. So in M ​​* L multiplied In IML N² Tau / A divide. N² Tau Up In Divide. Now I knew V = IR ohms The formula came from law. VV i so this R Is it supposed to be equal to the rest? ML /dec must be equal to ML /dec. Happen Needed Remember something. Do you have a I told you something else. R is proportional to What is L/A looking like? R look R L l a a That means if I make this thing constant If I give R is proportional to L / A and that What does the constant come out to be? Resistivity Resistivity Resistivity Look, look very carefully. That means that if i what if i m / ne² tau let me make it constant Will r become proportional to l/a? i.e. microscopic of resistance This is the formula. Isn't it hard? don't remember to do. do not remember. Just remember this method Which I have done. You can only do so much yes. Just promise me that sir, whatever you have Explained the method and how it came about. remember this Can. But Sir, it is possible that Phula may forget. There is no problem. Ok? Now a little further Look at one thing. Look back at you the way I will show you. First of all you need to know the current Phula knew. Veena knew. then you I knew the formula for velocity. email address Was. Write everything else like this. e na then You need electricity, electric field I knew the formula. v/l knew. Balance Let everything remain as it is. knew it? Say yes or no. Then I just How much did I tell you? The value of the voltage Remove its v key. So I put v right here kept. I went to multiply with m * l Divided by n e² * a Isn't it? Then I said remember v = hota Was. So v look I v so this is what's left this r It should be equal to . So the formula for r is Can you see clearly from here? Came? ml / ne² tau here it comes. Now a little back See. Did r have a formula? r l / a This was done in 10th class. These Had it done again. R L A So will this formula survive? Or not? This is the row, this is M / ne² tau hona Needed? Say yes or no. What month of Is the electron constant? Yes. What Is electron density constant? Yes. Is the charge of an electron constant? It happens? Yes. So what is this relaxation time? Is? That is, I can say resistivity Is this. What can I say? Say yes or no. What does it mean? I understand. Let's go now. it This is the most important thing. A direct question on this appeared on the boards, In CUET, NEET and JEE Mains. The question came directly on this. What is? Look again. Can these two phones be compared? Will you do it? r r l aa so what does this cry mean Is the resistivity comparable to this? May go? m / n² tau. m / n² tau. m The mass of the electron is constant. The electron density n is constant. The electron charge is constant. These What is? Relaxation time. these change Will decrease. So if I change these three constants Should I do it? Can I write like this? That means I I am saying resistivity is inversely Proportional to relaxation time. What does it mean What is? What was the relaxation time? Remember. These things are very deep and It is conceptual. Only that child understands this The child who has been waiting in lectures till now will come Is. This is the truth. Because in this lecture Till now only that child is left who is actually I want to study hard and the board Wants to top the exam. Truth Is. I already told you, Board. Exam concepts are starting to emerge. Now the board The exam is not proving to be hard. Conceptual Ane It is installed. Concept. Now understand relaxation. What was the time? Relaxation time was a The electron went and collided. So this is the middle It was a time of relaxation. if anyone The electron will move slowly and collide. Will this take much time? He slowly It's going on. It will hit late because slowly It's going on. So this was a lot of time. walk fast Used to be. Quick. I took the temperature, what did I do? Did? Quick. What happens if the temperature is increased? Is? Particles move fast. temperature Increased it. It is moving fast. what about walking fast Will it collide immediately? This time will be less. Relax, can I say temperature? On increasing Will the relaxation time be reduced? Because now they will collide frequently. Did I tell you about raising the temperature? The crowd collides more here and there. Resistance increases. The obstruction increases. Will increasing the temperature increase the relaxation time? become less? Time is running short. Quickly Are colliding. The obstruction is increasing. What Blockage means resistance is increasing? Yes Don't say it. Increasing resistance means increasing resistivity Is. I enjoyed it. Write it down. Ok? Remember that increasing the temperature Only the conductor should take care of the conductor. Write it with a star. This is just for the conductor There is talk about it. Reverse in semiconductors It happens. We will read that in Chapter 14. Increasing the temperature reduces the relaxation time. It happens. Why? colliding quickly Are. Now that time has reduced, right? Quick It is colliding. Quickly means less time. So Resistance increased. Why is the resistance increasing? Used to be? Because resistance is increasing. If resistivity increases, will the resistance You have to grow on your own. Resistivity as a kind of Because its DNA itself is that of resistance Tells about him. Tell me did you enjoy it Brother. And you saw how small the level is. I told you about it. This is you Studied in class 10th. Let us go Come on. So this is variation of resistance. So this was the basic formula of resistance. This was the formula for children. Today what I Brother, tell me what did I make you do? Tell me the formula I taught you today. ml/ne² ta This is the formula I read today. Isn't it? So the resistance will be higher The shorter the length of the conductor, the Area. Ok? Resistance radius also It is depending. Look at it. Why? Area It is written here. Look, there is an area πr². So what about the inverse of r²? These people understand I don't know where it came from. This formula is your Remember directly. What is this? telling Are. If ever I say I wrote 1 2 3 go. Suppose I ever said there is a wire. Its I will ask you a good question. of this wire The resistance is currently R. How much? Write RO. RO What did I do? Heated it. That means, let's say its temperature right now was T. T1 I increased the temperature, the temperature. be T2 Went. And let's say there is resistance Register. So the new resistance formula is Hota Hai RO Old Resistance Bracket 1 + What is alpha, alpha, this is the alpha of every wire No matter how much you increase the temperature, everything remains the same. It is not a little hot, it is less hot If someone is too hot, he tells me this Alpha is called the thermal coefficient. Resistance Alpha Delta T Delta T Meaning This is the formula of change in temperature. We would like to write this further in detail. So you can write. RT = Look at RO Put the multiplier in. I did it and multiplied it inside. RO * Is RO okay? Look at it brother. any problem Look at the problem brother, you put it in minus here Bring it. RT-RO Ok? And Yes, bring it to the divide. What to Bring Divide In? Bring me to the divide. RO Delta T Alpha can be extracted like this. Delta T would be is T2 - T1 and write it here. Take R2 RT - RO / RO T2 - T1 You can write it like this also. Write it brother. Very It was a basic thing. This was basic. you Phula, you have to remember this. I did this myself Made it from this. look a flower you know Is. 70 flowers would automatically form from it. Are. Come on, come forward brother. A little more concepts in this chapter Are. I know in the first chapter and in the second There were only a few concepts in the chapter. This Chapters are a little light on concepts Let's come. No problem. Now slowly You have grown up too. Yes. as As the chapters progress, little things will be covered in them. You will get more. Isn't it? This is a topper and an average The children become clear. Look, first Chapter 12th has new enthusiasm. Board exams are about to come. Of course! You're scared, but still You knew it was just the beginning. And The first chapter takes a lot of time. In. Taught the first chapter in school itself It is taught in coaching. Then If there is a backlog, new batches arrive. Then The series is available on YouTube. so many times You read the first chapter. Second chapter approx. It is similar to the previous one. from the first chapter It was similar, right? Second chapter approx. That was it. The real truth is revealed in the third chapter Thing. In fact, things change a lot in the third chapter too. All the same things you studied in class 10th. Was. And let me tell you the special thing about the fourth chapter. Fourth and fifth keys. Fifth Chapter Exactly Same as what you read in Chapter 2. Exactly the same. If you read chapter two Did you take it, didn't even read chapter five? It would have happened. You just have to see it once. I tell I have been. I just want to tell you guys one thing I want to say. It may be that your Half endly exam should be done soon. be a son We may not be able to complete that many chapters. Just take a promise from me. I today I give you a promise and I also give you I will ask. I will take this one to your end The shots are going on and they will end as soon as possible. By the time September or October ends November until the day I write this one-shot I will get it finished. And if you have all these I looked carefully at all the one-shots and what I I say all those things inside the class Fulfilled it. I guarantee you that you will be in November. You must be feeling confident sitting inside. When they are going to come to you, right? They tell them pre boards so you You will be so confident in Physics when The child is the most lazy in Physics. Whatever happens to you people, Let me tell you about the one shot I am getting done in But just do it in a strong way, okay, let's go. I will keep meeting you, don't worry I will take you from time to time in some way or the other Let it sit at room temperature Let t1 be 27°C. Ok? Given is the first thing to write. Resistance of a heating element. Write it as resistance R1. i.e This is the resistance in starting. What is the temperature of the element if the Resistance is found to be so? Saying Now the resistance has become so much. this final There is resistance, right? So now he is saying What will the temperature be? T2 is asking. Ok? given that the temperature coefficient Given this is 1.7 * 10 to the power of -4 Degree Celsius Inverse. Direct The formula is applied. (alpha) = r2 - r1 / r1 t2 - t1 This is the easy way. to do that You can also do it with the flower which is in the beginning I told you. How much is alpha? 1.7 * 10 ^ -4 r2 - r1 117 - 100 How much is r1? How much is 100 t2 - t1 t2? Have to take it out. - 27 Take it over there. to 100 Let it be. Bring it over there. t2 - 27 117 This leaves 17 100 is left below and this also gets divided. Here Okay, remove the decimal. 10 goes over 17. Zero to the one over zero to the power of 10 -4 up 10 to the power of 4 down is what is 10 left 10 power 3 hello say did this come t2 - 27 = 10 to the power three is 1000 The minus here turns into plus 1027° I enjoyed Celsius, it was an easy question. This type of question will come, it will not be harder than this. Come on, don't worry, why are you taking the trouble? Yes brother, why are you bothering me, it's okay. I told you a few things, now I have a question for you. The questioner will simply ask, tell me If ever the relaxation time of a conductor be more If the relaxation time is too much then tell me Tell me, will the resistivity increase or decrease? If the relaxation time is more Will resistivity increase or decrease? think and tell just. Ok? Let me give this answer also. I here. Look at it brother. Ok? See Here you go brother. Let's move ahead. 1 2 3 end Go. It is temperature dependent. I already told you. Look who your conductors are, good Isn't he a conductor? Resistivity within them It increases slowly with temperature. I had told you this. Hey Resistivity directly proportional to temperature It doesn't happen exactly directly. As the temperature increases, so does the resistivity. It increases. The resistance increases that much. But Exactly this does not happen directly. Directly means no doubt when you If you increase the temperature, the resistivity increases. But it does not grow that much in the beginning. Isn't it? We have already seen their relationship. But this The graph looks something like this. That means you are looking Ho in this graph the resistivity is Increasing with the temperature. here too What is resistivity? Nichrome. What is nichrome? Alloy. Nickel Plus Chromium is made by mixing Nichrome. Your resistance here too What happens? increases with the Temperature. But the opposite is true for semiconductors. It happens. Resistivity by increasing the temperature It decreases. Yes. I will explain this in Chapter 14. Reese. Are you raising the temperature? Its resistivity is not increasing. Less The opposite is happening. exactly the conductor's He is doing the opposite. This will tell you Where? Inside Chapter 14. Ok? Let us go. Come on brother. You should know all these things Needed Like we read Resistance. Resistance means obstruction. the opposite would have been is the conductance. Increase. Oh, a stopper An enhancer. So what does resistance mean? barrier. Conductance means elongation. Conductance is basically good current flow. Resistance means stopping. Reciprocal of Resistance. That is, the opposite of resistance is Conductance. Its unit is also completely upside down it occurs. Resistance is ohm. Om Inverse. Or the opposite of OHM is MHO. You can remember any of these three as per your wish. Such was the resistance. Here the conductivity Is. The opposite of resistivity is conductivity. Look, this was resistance. of conductivity This is the symbol. This is called sigma. So Reciprocal of resistivity is Conductivity. The unit is also completely opposite brother. He had an ohm meter. ohm-1 m-1 reverse Did you go? Or look at the attachment, Om is the opposite of it. There is attachment. These threads of attachment go away from your fingers entangled There was no need to investigate how this fell and how it was resolved. Every pore is a star Now comes a useful thing, vector form of Coulomb's Law Sir, what is this? Why is Coulomb's Law? showed Why is Coulomb's Law written? ok yes ok Is. Absolutely right, absolutely right. Vector Form of Coulomb's Law. Vector Form of Coulomb's Law I will tell you. Before this we Where did you go brother? Oh no, he accidentally ums I had to write the law. Coulomb's Law was written, brother. Brother, tell me how I am? came out To teach the vector form of Ohm's Law. Here Coulomb's Law has been written. Wow wow wow wow. Our DTP operator sir OHMSL Oms Law Om Baba Logo We are giving vector form. So what are you Have we taught you all these formulas? Tell me brother. I have taught these three formulas. We have to hustle these only and nothing else. to do. Just look. What is the first formula? J? What is J? Current density. Remember? Can I write this instead of I? Yes Don't say it. V na what can I write? already What was below? A what? Tell me, cross out A from A. Brother. Cut it. What's left? Venn just left VN. Only this much is left. Tell. Look at it brother. Do you already know another formula? Is. Which formula did you tell me brother? What I Formula V right? You put and this We also have a formula for resistivity. It is visible. Come on, tell me. J just like that If you are writing then you have read the formula of V Has it happened? Hey, its formula is V. read Is? e Tau / M read? Say yes or no. What Already wrote here EN? Say yes or no. Look brother, what has come in its place? Look, write n like this e * e² ne² this tau already written below m already written Yes no tell me is this e electric field Instead of this I can write v / l say yes or no Hey, tell me quickly, hey, tell me quickly Brother, if there is any problem, tell me everything quickly. Things appear before your eyes. I will go and create a ruckus, is that all? The formula is of resistance, say yes or no ml of resist resistance rather do one thing Are. What is the need for resistance, friend? Leave it, there is no need for resistance. e such Let it be. Leave e as it is. is this Your reverse resistivity formula Is? Hey, look at the flower of resistance. m / ne² tau. This is the opposite by the way. m / ne² tau. That means write down the resistivity. Above Electric field below j. What The opposite of resistivity is Conductivity? Hey, the opposite of resistivity There is conductivity. Can I write here? j = What both vectors? This is called the vector form of Ohms. Law. Just remember it like this. gave this the name Vector form of Ohm's law. how will you write it If she comes in the exam. Isn't it? Just like that How will you write the last one? First Edge V No that current age we know So first of all you will write this formula. Ok? Then you will write also we know this. Then put there You will value it. Are you watching? So first of all j = i / a i has the formula v na and v The formula is e tau / m so e is Let be n * e² tau / m is this Resistivity Formula reverse sigma so here's your vector The most important form of Ohm's law in this chapter There are more derivations. most Derivations and not all derivatives are such that You have to remember. But if you have these derivations then you will You have to understand that when Sir said AT, Bhaiya, whenever you see All the lovely and lovely ones, last look brother When AT Bhaiya wrote this instead of vd, then this You should know where it was written from. If you have done this much then brother I will give you I guarantee you're brilliant And you will definitely achieve something in life. Because basically what is wrong these days is this I realized that children don't use that much common sense. They wonder where this came from. That's why I already wrote down all the flowers. So that you know what I From where am I picking him up and throwing him? how many children Tell me if you understood it the first time just. And if it doesn't come, I'll remember it. I told you something about positivity. If ever something happens in the first attempt in the class I did not understand. No problem. to myself Don't underestimate. Don't think that we They are fools. What happened? We don't know. No problem. Many children are like this. I was also not someone who got it the first time. I understood everything. So that's why I I understand. So you guys don't worry Lenny. You are not afraid, right? Do not be afraid that Force yourself to be scared. ATI had once said I should come first. I so I am not coming. I am a donkey. nothing like that Is. This is not necessary. So just try Do this only after understanding that if you get up this time If you don't understand this topic, watch the video there. Stop it. Eat food and drink, drink tea, Drink milk and milk. Are? a little while Get refreshments and go out for a walk. come again Try it again. Trying to understand one more time I do. Maybe in two turns. yes It could be done in three turns. It could be four In turn. Sure guarantee it will definitely come. Correct Is? Let us go. Let's move ahead. Look at this brother Limitations of Ohm's Law. What would basically happen Is? Not all conductors follow Ohm's law Do. Isn't it? So the conductor which follows Ohms law Let's call them ohmic conductors. What? Ohmic conductors. Ok? So Joe Oms Law follows, their graph always what will be? Straight. Ok? Ohms law which does not follow They are called non-ohmic conductors. Ok? These were the limitations. Limitations Basically all conductors follow Ohms law do not do. Meaning when you increase the current and V Directly Proportional Exactly All I am not there. Ohm's law is just this. There were very few people who followed it. Are. So it only holds true for those who V considers proportional I. Ok? Take care. So this semi, this actually C The graph of the semiconductor is of superconductors. A wala us alddo ye Don't want to know. But it was in your book. That's why I told you. Ok? come now Power. Sir, I don't have any power. After this, Sir Cell electric cell and hey never mind. I am doing this intentionally. I remember When you were in class 10th, you were the power. what is power It happens? Rate of doing work. rate of doing Work means work up time. Hey Work Ka You already know what the formula is. Is? This is your work, v*q sir Where did you come from? Hey from here v = w/ q here to q move to vq can I write Am? See if the power formula works. Full of time work v * q upon in advance It's time. Whose formula is this? Of current. v * Has the power formula arrived? VI Such Things come. what is the formula for power Is? v *i what came? v *i Isn't it? Now imagine if I write IR instead of V Remember? Now two formulas will be made here. If I write I * R instead of V, Ohms law From this a formula for power will be made I² R will form. But if I is replaced by the current I If I write V / R in place then the formula for power V² / R will be formed, so you are seeing this flower is power inversely proportional to R Of resistance. Power in this flower is directly proportional to R. This only If the teacher teaches you this concept in class 10th He must have told me then heads off to that teacher. But 90% of the people ignore it. formula They make you memorize it and move ahead. you are mine If there is any 10th class video then You will see it on YouTube, I have also done it Have you explained why this happens? So remember if you ever see voltage Make it constant. You did the voltage Constant. Isn't it? what to do to the voltage Gave? Constant. So if someone like this It is an appliance, for example, a bulb. If you increase its resistance. Listen and watch carefully. Look at this first. Is this thing clear? 1 2 3 Power Key That is the unit. Let you remember You studied these circuits in class 10th. There will be series and parallel. Remember? Class Not in 12th. Yes sir? Yes, it is not. Series Parallel Circuits in Class 12th There is no question. But you did it in class 10th. Must have read it. It doesn't matter if you have forgotten. then some There were such questions. It was a series circuit. There is one No? There was a series circuit. Here it is. Series Meaning In which direct addition is made. Meaning Name them as resistances R1, R2. Let's say it's 100 ohms. 200 ohm, 400 ohm. So if I asked you how much resistance you have? So all three Simply add it. There used to be a parallel Connection Sem 100 ohm. Hey brother 100 ohms, 200 ohms, 400 ohms. If I ask you, tell me here how much Resistance? So let's add them like this 1/100 + 1 / 200 Remember? +1 / 400 This used to be In parallel connection. So what about in parallel? It happens? The resistance is low. Let us go. I taught you two formulas. one taught Power = I² R taught? One taught P = V²/R taught? If I teach you one more thing It was in this that the current series is the same in the circuit. Current is a bean. Remember? And here the current varies. near it Different, the current near this one is different, near that one is different. Here the voltage is same V. Here V is the same It used to happen. Remember? The voltage here is the same There is current. So if I make the current constant If I give it to the power proportional to R, then whose The more resistance, the more power it consumes Does. Meaning here the bulb which has more There is resistance, suppose this is a bulb, then this The bulb has more resistance, this is more It will glow. That means it will burn brighter. Whose More resistance means more electricity He pulls it. Accept it like that. So that's more It glows. So if the current is kept constant Keep that in mind, I am talking about series connection. I. If the current is made constant then The higher the resistance, the more power Because it is directly proportional. Here The opposite happens. If I change the voltage If I make it constant, then the one who has more The greater its resistance, the lesser its power. That is, whose The more resistance it will glow the least. Lowest Glow That means it will glow the least. Did you enjoy it? What a cool concept. So Physics is all about magic. dong dong dong dong dong dong dong dong dong dong Dong dong dong dong dong come on. Its Then comes a concept called heating effect of Electric current. This was also in class 10th. But it is actually there in 12th also. Isn't it? So You have already read the formula of power. Took. Well basically you know power What is equals two? Work/Time. Do you know? The work would have been the same The amount of energy we use. Isn't it? So can we also write energy instead of work? Are? Power in Time Multiply * Time. Are we talking about energy here? of heat energy. So I wrote H. of energy Wrote H in place. What is the formula for power I² Can I use R? This is where the heating came from Effect of electric current. saying this is Joule's law of heating. That means you are someone from high resistance wire like yours Heating heater wire. No high resistance If you pass current through the wire, it glows. Is. It gives heat. Why? because it is you You are going to heat it and it will get hot. Has been. She is not melting. That is, such Wires with good melting point Is. It does not melt quickly. As Is it nichrome or is it also a metal? Tungsten is present in bulbs. Tungsten, right? Some of your alloys are like this. basically We use alloys in this concept. Alloy means alloys are those which are mixtures There are. like nickel and chromium The mixture formed nichrome, an alloy. So their What is special about it? Burn this water, burn it Burn, burn, keep burning. These would be hot Will remain. Keep glowing, keep getting hot I will stay, I will not melt Eli. Melting Their points are quite high. Ok? Alloys Have Very High Melting Point and High resistance. So here we use We are mostly alloys. Ok? And this is what this This is your heating effect. so one Look, you can also put this formula of power. yes. This is what has come. I trust you, brother. Ok? Come on brother. Come now brother. this is Look, those were the things that your class 10th I was in. Got a small revision. Because I was in class 10th as well as 12th. is also asked. So it was my duty. I didn't want to tell you, but I I didn't think about it brother, it's ours, it's ours So they are our own. Come on electric cell Go. So the brother from the electric cell said It is a device which converts chemicals Energy into Chemical Electric. Useless talk. Hey, basically an electric cell and nothing else. Is. I have seen you putting it on TV. Some? It looks like this. Here it is. Here it is. Filled with electrolytes There are. Isn't it? those electrolytes Basically chemical reactions take place. and him In which do you change? electrical It changes into energy. Now accept it You brought a battery from the market. Brought the cell. It is written on that cell. what was written Is? Will he even tell this? on that cell It is written. 12 volts is written like this, you felt 12 volts This is a potential of 12 volts, so what did you do, put a bulb here connected to and connected from here positive This is positive combined with negative. It is negative and a bulb is placed here Gave ok, I have put in the bulb There was resistance 2 ohms So tell me how close the current is to the bulb Should be. Tell me how much current is there in this bulb Tell me should I go? What current should I go to? = V / R 12 / 2 What is 6 ampere current Do you want it from a bulb? Say yes or no. should come Tell me you shouldn't come. But it was found that the current that passed through this bulb Your current happened 5 amperes. Oh brother 5 not 4 amperes. 4 ampere current means it should have been six But it came at 4 amperes. That is, from whichever shop you Bring the battery on which it was written 12 volts, that is 12 It is not giving volts. She is giving less. Think about when this four can come. When will this four come? Can it? This four can come when it is up and down It is only 12 volts. No above 12 volts Yes 12 Voltage is the same. But there is some resistance below Is too much. Let's say it's four. Not four, but three Is. Resistance is three below. Is that when 4 Ampere will come? Say yes or no. 3 * 4 = 12 That is, the resistance is not two in 3 ohms. There was resistance to this, but yes, so The cells that you have inside them too There is a barrier that prevents chemicals from interacting with each other. Let's collide. It is called internal Resistance. So your cells are We denote the blockage inside them with a small R. Let's denote. We call this internal Resistance. This causes a little energy It is already used. Got it? Got it? So basically why did the current come? Do you understand why your current is low? Happen I needed 6 amperes but how much did I get? Four. This means the internal resistance of this cell. and the internal obstruction of the cell The current decreased. So which battery shop you are in? Brought from So basically, let us see how much the cell has Tell me the voltage used. The cell. Cell How much voltage? current reaches the cell Four. The resistance of the cell is to. So look at I * R what? 4 * 2 8 volts. Did the cell use Did it have 8 volts? Say yes or no. Sell ​​what you bring from the market Sorry, this is a bulb. from the market that you The cell I brought is showing 12 volts. But How much is approaching it? 8 volts. So This 12 volt one that you brought from the market. i.e This is the voltage till the time you use current Didn't do it. What do we call this? EMF. What do you say? What does EMF mean? Are? EMF. What is EMF basically? How much maximum potential can he give? Maximum potential. Ok? Maximum potential when no current It is flowing. But as soon as the current flows, The voltage used by the bulb used He was nothing less, he was given a name. Terminal potential difference. What? terminal Potential difference. it is defined as the potential difference when current is being Delivered to external load resistance. External load resistance means external To things. This is called terminal potential Difference. Understand? what you brought from the market When the cell was written on its voltage EMF is not used unless you use any current. are. The potential that is being used as soon as it is used It is called terminal potential Difference. What is internal resistance? Who There was a blockage inside the cell, he was told Internal resistance. How easy brother. Any Tell me your problem brother. Tell. Ok? These small things are clear to everyone. Let us now look at one more thing. One thing comes I will get it written right now. I will also write the definition. Let us go. electric cell This is the symbol. Internal resistance here. Ok? You have to look very carefully, right? These Bulb When you brought it from the market, I was telling it am emf e. Now assume the circuit is closed. The switch is off now. is this what you call it EMF. Isn't it? EMF. Ok? Now as soon as You turned on the switch, is there any current from here? Did it flow? Say yes or no. Isn't it? When you sent the current, the EMF What is? Total voltage. As long as the battery is used Was not done. Isn't it? But the one near the cell Is it reaching him, am I saying this? Terminal. How much is that? V. Are these two equal? No. what emf Is it big? EMF is the voltage when the current is used It did not happen. Now that it is used up, the voltage will decrease. It's done, right? This is the terminal. These emf. These terminal voltages. Do you understand the point? Tell me, this V is actually E V It would be that no V is how much what V is that voltage Which reduces some of the emf? This happened because the current passed through this also and this Resistance R was it, did it eat something? Voltage it ate something Voltage yes Tell me how much current into it he must have eaten Did the resistance consume so much voltage? Think about it, you consumed so much voltage and tell me I will give you one more example, don't worry, basically that the current in the circuit and its internal Resistance is the terminal voltage. This Let me explain in this language. Let's you Explain? accept it This is a bulb. Same previous question A Om Of resistance. Ok? Its emf is. Take the emf you get 12 volts. And give it 1 Om. Give it 1 ohm. Ok? Let us go. tell me first If I did not have this EMF, then the current How much would it be? Simple. 12π / 2 6 amperes. What happened because of this? How much is the current Just look. Your current is on, leave it. Let us go. Check the voltage. Come on, let's see the current. How much current did you get? Ah 12 / 3 right here Came. This is what you just taught me, right? 4 amperes came. 4 amperes, right? Just listen. What is the voltage of this bulb? Listening Meditation What am I talking about? See how much current Is? Show it again. Current came throughout the battery The actual voltage was 12 volts. And Total resistance is this plus this 2 + 1 3 what The current came at 4 amperes. So just for this How much is the current? 4 amperes. resistance How much is it? So what is its voltage? V. What is this V? The voltage it used How many? I * R 4 * 2 = 8 volts. Is this it? Say yes or no. That's it. So now a little Let us verify this formula. 8 volts How did you come? emf was 12 minus emf was 12 No? How much is minus i? Four. How much does small R Is? Forest. Verify it. The beans are coming. See Take a look. Just look at it. Where did you see the flower? Came? Basically your V is the EMF Was 12 what? You will subtract 12. The voltage is equal to the current passed through it. How much Did you pass? 4 * 1 is one resistance. The current is four. 4 * 1 = 4 You subtracted I * R from the emf. Terminal voltage came out? yes no Say. Understand how terminal voltage is determined. Is? Say yes or no. By putting a star. Now this thing I have written it all to you here. Look at it brother. Look look. V = E – IR that is Complete. This was clear. This is the condition then When your cell is in discharging condition. This is called discharging condition. i.e when you are using the cell when you are using the cell You are using it but you are also charging the cell phone. Do you. Don't do anything. Just this minus Put a plus in place. What condition is this? Charging condition. That is, if the cell is discharging. Discharge means the cell is being used. So this E-R, right? But the cell is charging. If the cell is charging then it has a plus in the middle. Do it. Just look at it, such a small thing Yes brother, there is no problem whatsoever. Just tell me your problem, brother. Okay, let's go. Brother, come on, okay, one question from here. He also asks you a question. Brother, tell me the formula for current. I understand this, discharging and charging Here I would only ask you the formula for current. Well, you won't know I Read repeatedly without taking breaks in between I am here, I may not know, I may not It has been ensured that this transition It is absolutely smooth, isn't it, because brother, this The kind of fever I have Typhoid What does it contain? I am speaking Yes, after that I am feeling breathless. Too late. Yes, I am talking about that After that I am having difficulty breathing. So that's why the same Isn't it? That's ok. So let's look at a formula. You just read a formula for discharging. of v = e - Can you tell me what is v? v = ohms What was the law? V = then instead of this v we can write I * r e - IR minus IR over here plus Should I come? So IR + I small R = E, I take the common R + R E Leave it like this. So one of I This formula has also arrived. Alldo I told you Directly told to remember the formula There is no need for this. What did I say? Did I give you a direct current? Taught. But if anyone wants the formula then You can also find the formula for current. while discharging Off sale. When the cell is discharging, it means It is being used. Ok? This is yours There is a formula. as if in a circuit There is a bulb here. Ok? here one There is a cell. This is internal resistance. This small It is R. This is E. put a voltmeter here You give it. This is what happens, V = IR. here The current that is going I. These volt meters How will you measure the voltage of this bulb? So V = Do IR. You might remember that you studied it in 10th. You must have forgotten. I won't tell you anything. A voltmeter is a device that measures voltage It always connects in parallel Is. Look at connecting in parallel. Similar ammeters There is a device which is always in series Connects in. We will also read further Do you know the voltmeter and ammeter? Complete details will be given within the chapter. How is a volt meter made? How to make an ammeter Is? What is that? How do they connect Are? Everything will come. Don't worry. I was out of breath. Ok? That's ok. This thing is clear. I have seen this formula. It was very easy. Any Tell me your problem brother. Come on, come now. Combination of cells. Now he is telling the cell Combine a lot of them. See this page also Take. Let me explain this in detail. Let us go Let's see. Understand the meaning. Suppose here is a Cell. Internal resistance. Cell Internals Resistance. Cell internal resistance, right? Let its emf be E. Its also E, its Also, if E is same for all and this resistance Suppose R1, R2, R3 do you know If I talk about the series then all these If this were E1, E2, E3, it would be a simple add. Do you believe E1 + E2 + E3 goes? Say yes or no. Now let's say this total is how many, let's say n number. There are many. This is n emf. How many are there? n e to the power N. Accept it like this. That is, how many Are? There are n cells. There are n number of sales. Ok? So can I say EMF? Will the net that comes be ne? yes no Say. The net emf will be Ok? What will be the resistance? Net Resistance Tell me resistance. Can I have a Should I put the bulb in? Suppose you have installed a bulb. This is the resistance R of the bulb. So tell me the total How much is the resistance? Equivalent Resistance. What is the total? R1 + R2 + a task Do this, treat them all equally. R2 R1 vote Take. What should everyone take? Take the equal. That is, R E means all the resistances are R + R + R + R Should I write N * R while doing it? in N * R If you look carefully, this is also a plus. This is the total resistance. The net emf is Happened. May I ask you how much current will be? Then you will tell me. What about the current just now? Did you tell me the formula? I = Look at this one. E / R + R these E / R + R is this the formula of current when all All cells have the same emf and equal resistance Will be of. This is it, just look at this formula. I have already got it written, friend. take a close look just. Is this it? Hey, tell me brother. take a look Brother. Are? I understand this thing clearly I? But suppose if you add it in parallel. So if you connect these in parallel. Whose was this? Of the series. Whose was this? Of the series. If you add it in parallel, Think about one thing and tell me. a very sturdy The concept will come now, right? Here it is, accept it. These Let it be. Ok? Such dash dash dash dash How many N number of sales while doing this. This is also E, this is also E, this is also E, right? this also R, this is also R, this is also R. So, in parallel The voltage is the same. Potential bean Is. So these will not be added this time E + E + E Will not done. Direct your net emf How much should I write? Because the voltage is It happens in parallel. Just write E. But, How much resistance will there be? How much resistance will there be? What? in parallel will be 1 / R + 1 / R + 1 / R. So here it comes Will N/R go and what will come with it? which a You add the plus resistance, this one You are connecting the bulbs etc. together here comes the. So this time the formula for current What happened brother? E / R + N / R This time Phula came. So it's very easy to blow Is. I say don't even remember Phule You have it. Just look. Here's Fula again. From. look e / r + r / n o sorry I said r / n here n/r no sorry sorry yes it happened My mistake. I know. Sorry, sorry kids. Sorry brother, love you. reading with love Stay. Okay, did you understand? Hey tell me Two brothers. Were the questions a bit difficult? There was no sir. But look what has happened so far Was? This was easy. All the cells have equal EMF are of EMF. Of equal resistance. So The climax of the series has arrived. Parallel's flower here comes the. but if different if different What will you do if it happens to him? like here Look at E1 E2 something has arrived. That means this time Look, the EMF is different. oh ho oh oh come on Let me show you some magic. This time The cell you took is of EMF one Resistance R1 Ok? Second cell taken emf2 resistance R2 Isn't it? Here it is. Ok? Is this parallel? Can you see the circuit? Yes sir, parallel The circuit is visible. You tell me the current here. Can you? I1 same here, can you tell the current yes? I2 very carefully. What is the value of I1? Will it be E1 / R1? The value of the same I2 will be E2 / R2? Say yes or no. Are you in the Resistance now? Can you take them out too? their resistance What will happen? 1 / R = 1 / R1 + 1 / R2? Yes Don't say it. This will happen. Hey, tell me brother. Oho Say. Now tell me one thing after thinking. What If I want to find the net emf this time, Can I write the total current? Into resistance. Can I write this? Think and tell me. Hey, remember V = IR. V = IR That's it. V means voltage. This voltage Is. Can only write current into resistance Am? I have to find E Net. What? I Total Let me add these two. What is the total current Is this the total current? Say yes or no. What can I write? E1 / R1 + E2 / R2 What resistance should be written as Can I? This is 1 / R1 this is 1 / R. Good Tell me one thing, is it written like this anywhere? 2 * 2 what Can I write like this? Should this value be written as 1/2? Can I? So can I set the resistance as 1/ Can I write? Here? Say yes or no. I can write like this. What is the net emf? Is this also a way? Aldo this formula Don't remember. But I give you one thing I am explaining the concept in great depth. I want this direct formula written down. Gives. I don't tell you where it came from. Any Don't tell. There is no need for this. Even He doesn't even ask much. But still I I told you brother where is this resistance? Went? Resistance. Well, I'll write it like this I can, right? Just think and tell me. if somewhere It is written x * y can I write it like this? Hey, write this value one upon one. I can. Meaning, the same thing happened above. Will go. So write this resistance as 1/r Can I? Can I write? Say yes or no. See Take it brother. This might be written here. Look, look, look, if you solve this further This will come. Keep solving. Now what Need it? Solving direct questions. Ok? Now ask some questions brother. Tell Elder brother. Ask some questions. Tell quickly. Let me ask you a small question. Let us go Example. Example brother example. A small example. Here's one of your cells. One You've been given a cell and a resistance Internal is given. Second cell given Is. Internal resistance is given. Correct Is? Look very carefully. the question which One day you learned to make questions as well. You have understood the concept of Jana. So the question I am making it in front of you. Alldo me There are a lot of questions written in the last Are. But I am also in front of you I will make a question and show you. this question Let's say I gave you 2 volts. These Gave you 4 volts. Ok? gave this You get 1 ohm. I gave you 2 ohms. Very Excellent. Any problem? the questioner is saying Tell me what is the net voltage saying? E Search the net and tell me. So we don't even know the formula. I don't even know the question. accept you Don't know. I agree there is no problem. Should I tell you the easy way? Can you tell me the current here? Can you? How much is the current? I1 what current will be? V/R what? 2 amperes. what about here Can you tell the current? Is this also Is your V/R also 2 amperes? yes no Say. Hey, what is net voltage? Current total * Resistance. That's it. Tell me the resistance Can you tell me how much is there here? hey both It is in parallel. Resistance in parallel How much will it cost? Let's see. 1 / r = 1 / 1 + 1 / 2 This is your 1 How much did it cost? 2 + 1 Here comes your 3/2. These are 1/r of If I calculate the value 3 / 2 r, will it Will it be reversed? 2 / 3 Yes No Say. I I am telling you not to memorize the formula. Would. Only Basic Formula Current* Resistance. How much current came? Two. How much resistance did you face? 2 / 3 Answer How much Came? 4/3 volts. This was direct. Now Apply the formula and check it once. Let's take it. Sir, will this come from the formula? Let's see brother. Was this the formula? Now I want to explain this. you ever There is no need to memorize the formula. Brother, you should know the concept. formulas They are created automatically. Let's see. What E1 Yours is Two R1 is One E2 is Yours 4 R2 is 2 / 1 / 1 + 1 / 2 Solve Look 2 * 2 = 4 2 + 2 4 ok solve it How much will it cost, oh do it brother Here comes your 4 upon me nothing so Your forest has come here 2 + 1 3 No, no, I have made some mistake brother. Hey brother, something went wrong. Hey Current Total Stretch 2 + 2 4 was current sorry brother was current 2 + 2 4 Hey, because there are two above and two below, so total It became four, so the answer came out to be 8/3. Yes correct Is. Now it is correct. So look at 2 + 2 4 / 1 If your 3/2 comes, then see it will go up. 4 * 2 = 8 and divides by three. So you can do it by formula, or You can do it with jugaad, you can do it with concept. The answer has to be the same every time. I enjoyed it In the question. Let's move on to the next question. Let us go Next question. Another small topic Combination of Sales Yes. Now see what the questioner is saying. Is. You have read the series Combination Cell Of. You read the parallel. is saying Mix both of them. Hey, mix it. What Are you saying? Mix it. Meaning means There are a lot of cells in your series too. He is saying that there are many cells in the series also. Take. Isn't it? And take many cells in parallel too Take. Saying there are a lot of cells in the series too Take. Are? And many more in parallel Take the cell. Lots of them. Look, there is one. say this The one with the question is here. Are you watching brother Barkhurdar. He is saying this. He is saying this in the series also Take a lot of cells. How many? e en number Off Sales n Sales and also take down lot What does all this mean? Take down how many. m Meaning One line, two lines, three lines, doing it like this. how many m number of lines m number of lines m If you say so, then see if you get it. will go ne And nr yes don't say this so after mixing it you get like this will go and what will happen in parallel Look at this complete circuit in parallel. I will tell you how it happened. Basically what we Did? Solving series ones together Wrote it. And what happened? NR beans NEE here too How much while doing NR? M number Got it? He has done this. NEE NR This has happened. Look how much this total is. Is it everyday? There are m number of m rows. What Will NEE remain the same in parallel? Ok? Where should I write this? Let me write it here. NEE to SAME in Parallel Will remain. Ok? Upon What resistance will come? Just look. See Brother. Hey, add this R also. Don't add this R Forget. In the last. This is the last we R so You definitely add it, right? Is this some bulb or something? Accept it like that. This is R. Right? So R is plus NR Upon how many parallels? m used to do this R / N did it last time I remember. So the parallel ones I would have divided it by the number of roses. Yes, I divided them by m. So this I have arrived. So you can write this formula if you want. Of current. Or solve this m again. m its Will go into multiplication as well. then go upstairs Will go. So MN ne something like this will come. Look whether So just write this. then multiply by m Do it too. You can write this also. Aldo also It is very difficult. Meaning it will come when the paper It will become absolutely hard. So I therefore I told you that the paper may be hard or easy. you Have to be ready. That's it. Let's come now are the best in this class and this chapter Importent. Second important thing. What? The second important thing that you Was waiting impatiently. We know. Kirchhoff Baba. Kirchhoff Baba. Kirchhoff Baba He said, bring my law. Kirchhoff's Law. What This is the law that every child shies away from. Are you nervous? I have already read NCERT Wala already made a video on this channel In which I have only discussed Kirchhoff's law. I have explained it. You can see. Very deep Kitchoff's Law in detail. alone one video I have explained Kirchhoff's Law. take a look if If you want to see it. your faith Yes brother. Ok? If no one wants to see No matter. We will tell you. Kirchhoff Baba What did he say? He said, listen first. I have two rules. How many are there? Two rules. Correct Is? Let's go and time travel. Ok Kich Baba arrives. They have entered inside me. Listen carefully now. Yes children, listen, I have two rules. Which ones Two rules? One is Junction Law. One is a junction Law. What is the meaning of junction law? Junction Law. Junction means a place where There are a lot of wires coming out of each other. Meaning, here is one wire. Here is a wire. One Here is the wire. This is called junction. accept it The current here was 2 amperes. The current here 3 amperes came and the current coming from here is 4 Ampere. So tell me how much current is there at this point will be? Suppose this wire is going separately. What Can I speak? 2 + 3 5 + 4 9 what from here 9 amps gone? So what they said was that The amount of current that came at this junction It doesn't stop. That much current passed through. How simple. So here if you ever If you check the current, there is not that much current here. The current came from this place, three came from here Two came from here, four is saying that it is complete. It all came out from here, this is the bus junction law. See how he wrote this at the junction. If the total current is zero, then assume that the current comes here. From I came here then he I current two parts I went here and there one here I1 here I2 How much is left here, nothing remains here He said that there was zero left here and he saw it. Look brother, you can see it clearly, that is, as much as This is I, so together this is I1 + I2. I was I = I1 + I2 means there is no current here. This is called Junction Law. What are you saying? The Algebraic Sum. Do you understand algebra? Simple Edition of Current Meetings at Any Junction. If you look for current at a junction, How much will that cost? Zero in a network. This This is called Junction Law. Look at it. do it Brother. can i speak here Your 9 amperes are equal to these three. Of. Try it and see. So there is no current here. Is. This is the junction law. It's simple. There was one Your loop law. Loop Law What is Loop Law brother? What is Loop Law? Is? Just say it, listen. Here is the resistance. Here is the resistance. These Stayed brother. Here is the battery. He said You go from here. Let's go from here. Reached here after roaming around. Then reached here. Then Reached back here. saying if you You will find it by adding the voltage at all three places. You add voltage at all three places. They will always equal to 0. what did you say Brother? Let's read it once. Algebraic Sum of potential differences i.e. voltage of Different circuit elements. It is saying its Find the voltage here. then turn around here Remove the voltage. then back. So when you Every time you bring out an edition, it will be zero. Sir What does it mean? Let me tell you back. Let us go. Let us explain this in a basic way. Very With love. Let us go. Ok? Let's look carefully. Let's assume this resistance is R. here The current is I. Ok? Here the voltage is V. Correct? Everyone knows that V = IR. are you Do people know this? V = IR Can I write it like this? V – IR = 0 I can write like this. Look, I can write it down Am. That's it. I mean, I'm leaving here. And reached here and came back here. See When I got from here to here, what Is this the direction of the current? of current The direction is always positive to negative. Is. Meaning, it is positive here and negative here. Positive means profit. Negative means loss. Where are we going? from advantages to disadvantages On the side. Moving from profit to loss. Remember it like this. increase and decrease concept Are. Just listen. I mean, you were yours first. Benefit. Then you went towards loss. Do you lose at the end? Is? So this will be called reduction. deductible Meaning negative. Remember, subtraction means Negative. Let's write it here first. What do you do when you suffer a loss? Want to write? Minus. Write in minus Voltage. Now tell me what is the voltage here? Voltage is current * resistance. I * R IR come here, here, here, here, here, now look here Look back here, are you now minus You are going towards plus, now you say yes or no Moving from minus to loss to profit ho means increase means positive what I plus v of Look, is it written V-IR only? Let me put this equals to 0 because both You have written it, so write 0 in equals to Should I give you this loop or take it, it's all yours now. Questions come above this, Jamast 10 sa But what did you say sir, this is great, let me Let me ask you a question about this. Brother, please speak quickly, hey speak, speak quickly Speak quickly, speak quickly, he will do it Question: Let's ask a question first. Look at the bar, if you have to write the definition Bhaiya the algebraic sum of potential difference of different circuit elements of a close The circuit is zero. Ok? Mash means The circle you are making. the loop that formed had been. This is your conservation of energy. Also tells. This is for conservation of charge. Tells about. This conservation of It tells about energy. write this Take. A one-word question was asked. Is. Ok? Let's get you over it now Let us ask questions. Give some basic knowledge I have been to you first. doing the most basic I am first, right? Alldo these questions without Kirchhoff's law will also be solved. Isn't it? Have two cells ever been placed like this? These are Supporting cells. Supporting means this Supporting the other. Meaning meditation To see from. Look at its small stick, what is it? Used to be? Does this cell need current? Is there flow here? And this one wants a sale too. The current should flow here. So in such a case, their EMF gets added directly. remember If we assume this is 2 volts, this is 2 volts. If it is 3 volts then it will directly become 5 volts. Remember this is the concept of sale only. But if your cells ever look like this Are. How are you? Reverse. Now look at the notice do it. This cell wants current here. Go. And this cell wants current here. Go. So they are opposing each other. These are called opposing cells. So here What happens? Let's say it's 5 volts. This is 4 volts. So the answer will be 1 volt. It will become minus. Big minus small. which is bigger If it happens, we will write the current in its direction. Then. Will you remember? But right now I'm going to give you this He is not asking questions as per the rules. Now! You have to make sure that you know Not there. You need to understand Kirchhoff's Law. Because right now. So here's one. Here's one. Ok? Positive negative. Big Long stick positive, short stick negative. Big Long stick positive, short stick negative. Which one Tell me, will there be current in which direction? what current Will it be here? Are you sure? Yes, say no. What Will the current be here? direction of current, remember Keep the resistance that has been given to you Above. Apply positive and negative here also. Are. So where the current came from, the current came from here Meaning he came from here and went here. So where Wherever it came from, it was positive, wherever it went, it was negative. Positive, negative. Remember this. These Suppose yours is 2 ohm or 3 ohm, this is fine. Your 2 volts or 3 volts is fine now. Look carefully, now we want to understand which of the following The first thing you have to do is loop What do I have to make, loops and loops? If you want to give direction, give direction to the loop Di Bhai, please give it from your side clockwise. Give me whatever you want anticlockwise. Look, this question is so clear. I am telling you that it can be solved directly also. I am here, should I tell you the answer directly? Suppose the current in this circuit is The total voltage is 5 volts Resistance is 2 + 3 5 Answer will be 1 Ampere. You can see it. Now I call this Kirchhoff I will explain it to you. Answer: 1 ampere will come directly In this. Now let us understand this from Kirchhoff. Correct Is? Let us go Remember the concept of increase and decrease, brother. Sir. That's ok. Let's start from here. Where is the loop going? Positive to negative. Look at the loss, it's the minus Minus voltage. There is good current. I write it down If current I then what will be the voltage? Minus first have to put a minus sign because from here Brother, we are starting from here. We are starting. what about positive The loop is going negative and there is loss. So what is the minus voltage? Current Into Resistance 2i 2I is how much voltage is the current into There is resistance, come on this. beans again Look, the loop is going this way. with what benefit Harm reduction? Again minus 3 * What is the voltage? 3i Come here, come here. Come here, come here. Now Voltage Now look at the loop going here. Minus It is going from plus. Say yes or no. From minus Plus profit from loss. increase means Three of the positive. Oh, it's just voltage. No. Don't multiply it by current. Sometimes do 3 * I here also. This is already The voltage is given, right? This to you Resistance was given. Hence the resistance Into current then voltage came. Then look here. Look again at the arrow here looping from minus to plus increase so plus ka 2 equals two in what Do you want to write it down? Zero. That was it. -2 - 3 -5i 3 + 2 5 = 0 Is -5 here in the plus? If 5 * 1 = 5 then how much current is drawn? 1 Ampere. Did you enjoy the question? Tell me this. quickly. Whose example was this? of Kitchoff's Law. Now it has a high level I will ask questions. Now its a high level question for you. I will get it done. This was of low level. from small Of the level. Ok? How many children will have their first Did you understand in turn? Please do tell me. Ok? And those who understand it the first time What will he write? It is our Bhokaal. AT Bhaiya, write it in short ATB ATB. There is no need to write so much. own So Bhokal will become a bigger thing. Not everyone should know about this scheme. You should know the feelings, right? Ok? Let us go Ok. Now come to a higher level. Question. Every child is afraid of Kirchhoff. That's why I'm asking more questions of Kitchoff. Am. Look quickly and carefully. This is one Gave the circuit. Now this circuit is the same as the previous one It will not be solved like this. Isn't it? This is something It's a strange gift. In this you will get splinter flow. You have to find and tell the value of I by applying it. Correct Is? Let's try it. The first task What do you make the same loop? Rather what to do before the loop? positive Put the negative. There is current here, so here too I here also I now here the current is divided Two places. Isn't it? Let's assume something from here There is current coming. From lats. Here is I. Let I1 be the case here, then I1 is also the case here. Ok? I1 I1 I1 I1 came from here I here came from I1 what happened here is I + I1 It happened here I +i I1 say yes no Please look into any clear problem brother. I was there too. I was here too. So this together Done. Now let's start with the big stick. Positive. Short stick negative. big stick Positive. Short stick negative. Now the current Direction positive negative. of current Direction. So positive here, negative here. Here the direction of current is positive, here Negative. Direction of current: positive here, negative here Negative. Now the next thing to do is to make the loop. Make it. I only make clockwise loops. So I always keep it the same. Confusion It doesn't happen. Look at it. Ok? So the first loop Pay work. First loop. First Loop Pay work. You people who have come I will try it myself. Isn't it? Let's go here Let me start from here. Minus watch loop Where are you going? From minus to positive. Benefit There is benefit. Benefit means benefit Positive. Current into resistance 2i loss. Going from positive to negative. See Loss minus 12 come here. here here here See. Positive to Negative Loss of Minus 2i1 Here. Here and there, from minus to plus. Look, go here The loop is going on. from advantage to disadvantage Benefit. Positive Growth Plus of 2 I have come, I am done, there is nothing else here. Equation 0 became an equation, so this became 2i - 2i1 -12 + - 10 of this is your 2i - 2i1 = 10 to common take from here so this is left i - i1 and went into divide to here so 5 So the first equation became the number of children that this or either of these two equations Also a bun, very nice, amazing, amazing, amazing, amazing Okay, let's move on to this. ok make it the same again I make it clockwise every time. The confusion is over, okay, let's start from where? Let's loop from here and see where it is. Here it is going from minus to plus i.e. profit There is an increase in Plus's 6 * Dec Plus 6 * Dec Resistance * Current, hence voltage Made. Will you come forward? Come here. Look, the loop goes here. Has been. plus to minus loss minus 2 Come here. Come here. Look from minus to plus. The loop is going here. Losses from minus to plus Benefit from increase. So plus 2i1 = to I am zero. Look, nothing else. So look at 6i + 6i1 How much is - 2 + 2i1 = 0? 6i stay like this Two. plus 6 and 2 8i1 This minus 2 goes over here plus 2. See Look brother, there is no problem or trouble. Look, look Look look. Take two common from here. These Survival 3i + 4i1 and two will go into divide here. 2 / 2 1 This becomes the second equation. Look at it son. It remains to be seen how many children This equation occurs in the first turn. Ok? You must definitely see this. how many children that this equation occurs in the first turn Son. This is important. take care brother Sir. This is important. That's ok. It's cleared. I have seen ahead. Move ahead. Move ahead brother. Look at it. So two The equation is i - i1 is i - i1 = 5 i - i1 = 5 2nd 3i + 4i1 + 4i1 = 1 Do you know the elimination method? Do you know? Can I multiply this equation? Should I give three? The work will be done. So look at 3i - 3i1 = 15 and what is already written is 3i + 4i1 = 1 Subtract both and this is cut off This minus will become 7i1 And this makes your 15 - 1 14 so I's What is the value? o What is the value of I1? The value of i1 is minus 2, see whether. Do you know what minus 2 means? It happens? How can negative current come, sir? Hey, minus means what we thought There is current in the opposite direction. basically which Your I1 is not here. That means this The battery is dominating. current here It is actually true. So did you understand? If you ever get a negative answer, be afraid. Not there. Minus indicates that current is in Opposite direction. Remember I1 what? I1 Let me put the value here, put it here. Put it wherever you want. So Let's put it here. 3i + 4i1 i1 how much? , 2 - 2 amperes = 1 3i - 8 = 1 - 8 went here, so how much is this Happened? 9 3i So I how much did you get? 3 Ampere. i You have taken yours correctly. So Here comes your i. I enjoyed it. How many? Children get this question right the first time around. Happened? Just tell me this much. I want to know this I just want it. Did you enjoy it or not? Tell quickly, quickly, quickly, quickly Let's move forward quickly and swiftly. So Everyone understands Kirchhoff's Law? was easy. Let's go to the Wet Stone Bridge. I know kitchen of the flow It was hard. But I know it's still here The child who is standing must have found it easy. And He must not have found it easy to understand. He must have come and that child would be back after getting prepared. Come and then definitely write to me in the comments. I will tell you. Sir did not come in the first turn. Your AT did it in the second turn. Let us go Ahead. What is the Wheat Stone Bridge? Wheatstone Bridge. Wheatstone Bridge. So now As the situation is. Isn't it? So we need a solid bridge. Will have to make it. Just look. Suppose this is a There is a circuit. It doesn't have to look like this. This is different It can also be seen this way. confuse you To do. But how will we tell you? So what happened? were making an arrangement Scientist. So what did they see? accept it Here's 2 ohms, here's 4 ohms, here's 3 Ohm, 6 ohms here, 2 ohms here. He had a Cheese pie. What pie? If this one resistance and this resistance is called R1 Take. Take this R2. Take R3 and take R4 Take. They found that if ever R1/ R2 i.e. 2/4 is coming equal to 3/6. Meaning R1 / What is that? R2 should become equal. Its ratio is R3/R4 i.e. if the ratio of these two Their ratio should be equal to each other So it was found that there was no current flowing through the middle. Is happening. Oh brother, is there any current flowing through the middle? It is not happening. Just say this situation Given Balanced Wheat Stone Bridge. i.e Whenever the ratio of these two is equal then What happens normally? over here and over here Potential beans were coming. Potential Beans If it comes, then current does not flow. Isn't it? This condition is called balanced wheat. Stone Bridge. So if ever both of these The ratios will be equal to each other like this. This way If the ratio becomes equal then this condition is fulfilled. It is called Balanced Wheat Stone Bridge. This is your Wheat Stone Bridge. thats It. End. That was it. This is what is written in full Elder brother. Look at it. Ok? This was it brother. Ok? Now let's go over it a little bit Question. Look at this also. is saying I gave this one question. This is saying 6 Om, this 12 Ohm, this 2 Ohm, this 4 Ohm, this R is saying is find value of R is saying this R Give a value such that this whetstone What if the bridge is balanced, then it How much are you getting 6/12 and this How much is it? 4 / R yes no this is equal are Balance for Balanced Condition for Balanced Condition Condition Should the ratios be equal to each other? Yes, I did. Is this done, come here Went? 12 multiplied to 6 of four 6 * 2 = 12, 2 * 4 = 8 in divide what is 8 If Om comes, will the work be done? Yes, no, tell me. Tell me brother, let's move ahead. Tell me quickly, everyone. Speak fast. hey hurry up Say. Tell me quickly. Now the question begins What a shock he is saying brother. So tell me now Is everything clear to everyone? So you know this I have given complete details in depth in the chapter. I taught. Open NCERT for any one thing Look at it. If you feel like it, sir We did not explain this thing in detail. tell Give it brother. Each and every thing in depth and detail And apart from this, something in your exam It will not come at the conceptual level. But you People, promise me one thing. what promise Will you do it? I promise you this in every class I ask. I want to ask in this class also Am. Please please please my friend, this is my request My. You don't know the reality yet. When the exam comes, how will it come, then you I am asking for a small thing. I you I am asking questions here. already You made me ask so many questions. Still more I will get it done. Isn't it? Maybe you can watch another video from YouTube. See. Solve questions from there also. yes Maybe your school teacher too. I will solve it for you. Isn't it? from somewhere else You solve the question by looking at others. Ask yourself at least 100 questions You must definitely practice. Where will you do that from? There are two ways. Come on, today I will give you I give. In this class I will give you a lot of I will give all the questions in homework. That means there are many inside this PDF Questions will be included. that PDF I have already told you. the children who are mine They are on Telegram, you can find them there too Will go. You will get it on the PW app, watch it together. Where will you find it here too, where where here Hey brother, where did I go? I sent my Telegram I had given it, I had not given it, I had forgotten. Dude, you are also on this Telegram ID. You will also get its PDF there. If you get it, take the questions from there. But at least you should ask yourself this question. Apply any question bank from the market Buy it, do it son, okay let's go. Let's start with questions. saying storage battery of car storage The emf of the battery of the car is 12 volts. Say What is the emf? 12 volts. Everyone We will do it by posing. Brother, everyone will quickly. If the internal resistance of the Battery is saying internal resistance is 0.4 ohms. Ok? What Is the Max? So far What you have read is useful only if You did all these things well. Some? What do children think? Now I have read it. Let us go I leave the question. End. Zero. Nothing will happen then. There is no use in this Whatever you have read so far. I genuinely I am telling you. What is the maximum current? It is saying, what is the maximum current that can come Is? Hey, maximum current comes when no You have used the bulb, nothing has happened. So directly remove the maximum current. The maximum current will be E / R? hey most This could be the reason for the high voltage. 30 amps went to zero. This could be it Maximum current. Say yes or no. Hey, tell me Brother. Is this the maximum current that can be applied? Tell me quickly. This is what could happen. Other than this Will not done. Come on brother. Well, you go in Ok. Let's look at the next question. Good You know. Studying is really a beautiful thing I realize it. What are you saying sir? This is the most This is a big lie. Studying is the most beautiful feeling Is. And actually this is what I am saying Hmm, this is really nonsense. These are those children's According to the children who are probably in class now Not even. Then you will be happy. Your Not according to me. the child who What have I said? the child in the class It lasts for more than half an hour, right? Means has really come to study. Starting Only that child lasts for half an hour. Meaning In the beginning, the child disappeared within half an hour. goes. who doesn't care about studies Is. He came just to pass time. They I came to give myself false hope In class. That means you've seen some kids have who will always be afraid of how we How will we do it, they will tell us no bus If we find a way, we will read it and that They also start reading after 20 minutes. That false hope disappears, that class Vlas disappears leaving but one There are children like you who persevere. So till the end, the children who are still in this I have come here to solve the questions There are even You have already completed more than half of your studies. You have already done this, it shows that that you are already a topper that's it yes i know Okay okay. Let us go. Well, that's the case For you. friend, let me tell you one line at a time Let me tell you a line. I neither come into the heart nor am I understood. His dialogue was Bhai Bhai Bhai Saheb. Are. I neither come into my heart nor do I understand Am. My halfleys are about to arrive. I I am only seen watching the reel. These are your Tell those friends who are in class right now. Not there. Because the children sitting here Then he is going to read it as usual. So It was not for them. That's ok. Let us go Let's move ahead brother. Look at the question. it Have I got the question asked? Yes, Did not get it done. Look, battery of emf 10 Volt. Saying a battery is 10 volts of. Ok? n Internal resistance 3 ohms. The internal resistance is 3 ohms. Is Connected To a register. connect to the register Gave. Ok? I mean, look what happened? One There was a battery whose internal resistance was this. Connected it to a resistance. Value Here is the bulb. Ok? These R these E. Ok? Further saying if the current in the circuit is 0.5 ampere. It says the current in the circuit How much is it? 0.5 ampere. Ok? what is the resistance of the Register? I have to tell you this R. What is it Do you want to tell me? R. Is it okay? First of all Tell me one thing. Is V equal to two? E - IR. This happens. Can you take out the V? E I know 10, I know 0.5, R know You have three. 10 - 1.5 What did you get? 8.5 Volt. Has your V arrived? Say yes or no. When V If it comes then what happens to V? IR is V only What happens to your I*R? Say yes or no. Oho Bhaiya, is your I * R V the only V? Your 8.5 I find your 0.5 * R Will you take it? 8.5 / 0.5 decimal decimal over. Ok? So how much is R? 5 * 1 = 5 5 * 7 = 35 Has it arrived? R what else are you asking Is? Here is the terminal voltage. when the The circuit is closed. End. Terminal Voltage It also went away, the resistance also went away. yes The work is done. I enjoyed it. The question was easy. Let us go The brothers move forward. I have done everything in life. Those milestones that are passed on the journey Who do not come again. Who do not come again. ok i promised You did it in third class, did you not? I will tell you after the question. Silver wire is Whose resistance is 2.1 ohms. resistance Let's say R1 is 2.1 ohms. is saying What is the temperature? T1 27.5° Celsius. Resistance of 2.7 is now saying Resistance became 2.7. What is the temperature? T2 100° Celsius. Ok? He is saying tell me the temperature Coefficient i.e. alpha has to be told. Does it Did I tell you the direct formula? So alpha = r2 - r1 / r1 t2 - t1 Is it direct? over r2 - r1 100 - 27.5 Bye, sorry, I did it wrong. wrong oh wrong Wrong bombs said how much is it? 2.7 - 2.1 How much is R1? 2.1 Bracket 100 - 27.5 How much is it? 0.6 / 2.1 * 20 out of 100 80 7 out of 80 80 73 out of 73 0.72.5 72.5 That's it. It's 72.5, right? decimal to decimal End. Decimals removed up one went 10 3 * 2 = 6 3 * 7 = 21 This is your remaining 2 * 10 right 20 down 7 * 725 Okay, how much will it cost? 725. Let's try it. Brother, hurry up, hurry up, hurry up Quick I'm doing it, you do it too, friend. 725 5 * 7 or 5075 20 / 575 What is the final answer coming? 575 This is yours coming 0.39 It's almost here. Degree Celsius Inverse This unit is degree Celsius, isn't it? It is inverse, please check it brother, there might be some problem. So brother, please see. Here's Alpha. The unit also Remember this brother. Ok? let 1 2 3 end Go. You will understand this unit, you will also direct it. You can see. You know, look, its unit is ohm. Om for this also. Om was cut off from Om. from below Degree Celsius. If it goes up, the degree Celsius will be inverted. Ok? Let us go Ahead. 1 2 3 and go. saying heating Element using nichrome. Connected to 230 Voltage draw initial current. This much. Saying The voltage is 230. The current came to 3.2 amperes. Are you resistance? Can you take it out? Say yes or no. Resistance will come. Which Settles after a few seconds. saying a little Later he settled down to a study value. Off so much. It is saying that the current is now 2.8 Now the current is 2.8. Is the voltage the same? The voltage is 220 only. 230 Sorry. So what Will the resistance here be any different? Say yes or no. So you notice one thing had been. There will be more resistance here. There was less there. i.e. R2 - R1 is ok? Saying what is the study temperature of the heating Element If the room temperature is 27 saying If the room temperature means the first one The temperature was 27°. Now tell me what study What is the temperature that comes later? That's what he's asking. give the temperature coefficient I gave you Alpha, I gave it to you 1.7 * 10 to the power of -4° Celsius inverse. Here it is Are you watching? Can you see it brother? R2 - R1 You know. Let's try it. So I gave you the alpha. Alpha = R2 - R1 / R1 T2 - T1 Take it over there. Bring the Alpha R1 here. T2- T1 here. Ok? Look at it. Any problem or trouble? right here Solve it. How much is R2 and R1 coming? Let's solve 230/3.2. quickly Tell. R2 - R1 How much is R2 and R1 coming from? Let's take a look. 230 / 2 sorry 3.2 here it is 71.8 It's coming in at 71.8 How did the R1 come about? 71.8 Om. Take out how much it cost? It's coming to 82.14 So it came to 82.1. Ok? Correct? Now you have to solve this brother. T2 - T1 T2 you have to remove. T1 How much is yours? 27 R2 - R1 82.1 - 71.8 This is your 10.3 10.34 Take it, let's go. The value of alpha is Your 1.7 * 10 to the power of -4 R1 Your value is 71.8 So approximately how much does this come out to be after solving it See Approximately how much is coming after solving it. One Let's see how it is almost solved. I I don't want to spend much time on this thing. So I am solving it myself. you guys Try it. So brother, this is coming to about 847. Approximately approaching 847 And this is minus, so come here in plus. If it goes to 27 then it will come to 8, approximately 74° Celsius. It is coming, not exactly, it is almost coming Is. Let's move on to the next question, brother. Next question on your screen. Here it is brother. Look what he is saying. In a Wheatstone Bridge Is. If resistance P is increased. Saying Increase this resistance. increase tax Give this one. So look at something like this. This P, this Q, this R, this S is saying this increase Do it. Okay, let's increase it. donation Condition for balanced. Good balance condition When will it happen? Let's see. this to you I will explain it with common sense. Let's say using a lot of common sense, very little. C. Let's say this is two. This is four. These six Is. This is 12. Is this the wet stone bridge? Is? 2 / 4 1 / 2 6 / 12 1 / 2 Now saying Yes, increase this. If I increase it. Value Look, I made it four. Let's say four. says These four should still be balanced. Now this If it is four then either increase it. et it Two. Meaning either increase it. either it Increase it. This is one way. or else You should not increase it. or you can do it Don't increase it. Let it remain four. Is No? Increase it. replace it with six Make it 12. Make it 12 instead of six. That means either increase this one. Or So that will increase or it will either be P R Increase or Q Increasing the Resistance R. Ok? This is also fine. Decreasing the Resistance Q This is wrong. do not decree Can. Not this. Increasing the Resistance Not S. S will have to decree. S to Cannot increase it. No. Decreasing the Resistance R wrong. Increase this also. So Either increase this or this. So which one Do you see the one? Increasing the Resistance R finished. Ok? Let us go. That is, increasing the resistance R. You cannot increase S, right? If S If you increase it, you will suffer a loss. No Then there will be more gap. So look Increase either R or Q. Increase R Gave it. He has not given it to Q, right? It's just fine. End. I enjoyed it son In asking questions. Let us go. saying to Wires of same material having radii in The ratio 1 2 radius given the ratio in Given the ratio r1 / r2 1 / 2 their radius I have given carry currents in the ratio of these Above also gave the current I1 / I2 41 the ratio of their drift velocities of electrons In them. Drift velocities from you Ratio has been asked. Do you remember Formula V? Oh, you will remember. I equals to V, right? But instead of A What to write? πr² because here Look, it's a matter of radius. wires of same Metal Having Radio. Isn't it? So what are you Can you write the formula for current? Venn πr² Should I write this flower like this? See be careful. I1 = V I2 = V2 If I write this divided by then the remaining 1/ I2 V1 / V2 both of these are cut off. The pie was cut. See the square of r1 / r2? R1 / R2 You are given 1/2. Square V1 / V2 is to find you. It's yours 4 / 1 Is. See it quickly. Any problem or trouble? Hey look. It became 1/4. how much is it Went? 1 / 4. What is four and what is multiplied by Done? 16 So the ratio of v1 and v2 is 161 The question is cool, I am enjoying it, confidence It's coming slowly, tell me come on This one tells me the emf of the battery is equal to its terminal potential difference saying When is the emf equal to the potential difference? It is saying when will e = v happen, basically v = e - IR If it becomes zero only when the battery is Being charged. Wrong. Only When the Large The current is in the battery. Wrong. only when there There is no current in the battery. Tell me when there will be no current in the battery. Is that why you can have this condition? Because the current is not flowing. What Only then can you say the same potential, the same Bus. Tell. Tell. Think about it. You are my day, my evening, my night In my dreams, you, my voice, take your name, You should know this. My one day of 100 years There should not be one in which your picture is not there. Beirut This life of mine is devoid of your fragrance tell me who is your first love first love My first love, who is your mother? Half the children immediately pick up on the double meaning Brother and mother in my mind here and there And when I say mummy, understand papa Yes, if I ever say Papa then Mummy, together those two different identities Not there. He is one. Let us not separate Them. Let's move on to the next question. More brother. Let us go. ok listen listen listen Listen Listen. Now I give you a lot of I am giving the questions as homework. Like I promised you guys. Now I made you some promises, I I am fulfilling it. giving some questions I am inside doing homework. You complete the chapter Taught it in detail. from the very basics You have taught me the details, right? So I told you Fulfilled my promises. Ok? and one more And I promise you guys. whenever you have any exam or whenever You will encounter something that you fear You must be feeling that your AT brother is there. will stand. Sure promise. Ok? If Even if I am not able to come, someone will definitely come. I will come quickly to tell you that it is good Let me give you a quick one to you guys Do you need formula sheets or anything else? First Let me start with the chapter. Let's go to a chapter I will give you the formula sheet. Not this now You will get a small video. His I will give it inside, wherever it is. I will give you formula sheets etc. Let us go. Ok? Rest you can meet on telegram. There you have friends as much as you want Things will happen, I have already read everything but I will also return the notes myself. You will get it, just you guys Keep working hard and forget about me. It is not possible to go, take care of your ADB Don't forget brother and definitely in the comments Tell me which child watched this video completely And hats off to you for your hard work So just keep doing it like this till the end you remain like this It doesn't take much to keep working hard Just keep doing this till the end. You will get 90 plus in Physics. ok let's go jai hind kids tata c u tech Take care and take care of yourself. Will meet See you in the next video and here You will get the questions in PDF.