I welcome you all to today's lesson so we are going to start current electricity we've got two types of electricity that is what we call static electricity and the current electricity so I want to teach you on current electricity because this is where we find a lot of calculations in an exam most of the calculations that we see in an exam of the question that are falling under electricity comes from current electricity so we are going to discuss this together we are going to understand what current electricity is with some exam questions so there is a width here which is standing out which is the current so we've got that weight which is the current so you need to know the definition of current since the first thing you need to know the definition of current so how is current defined current is just defined as the late of charge so as the rate of charge flowing this is how we get to Define current so when someone tell you that Define current current is defined as the rate of charge flowing this is how we get to Define current so current it's it has got the units that are used for current so what are the units for current what are the units for current what units do we use for current what units do we use for current umpires so this is what you need to know the symbol is what the symbol is captured a that is the symbol that we get to use so once you understand what current electricity is then you know they they with current what current means so when we are talking about current electricity we are talking about the type of electricity that deals with charges that flow in conductors so we are talking about charges that flows in conductors then there is this with which is the current so what is current current is defined as the rate of charge flowing so the unit for current is ampers like that then the unit for charge there is a word which I've used there so the unit for charge what is the unit for charge what is the unit for charge since current we've said current its units are what amperes what about charge so the charge is what column this is what you need to understand it is what capital letter C like this so this is Chrome so this is the unity for charge which is but the unit for current these are the units very important you need to make sure that you know these the units once you put a small data a as the unit symbol for current then what you've written is something else which is not current so let's make sure that we understand these formulas the same way I'm writing them that's the same way that you need to know them the unit for charge is coulomb capital c this is how you need to know this so away from this you also need to know the formula for what current there is a Formula that we get to use whenever we are told to calculate current what is the formula for current what is the formula for current we say current is equal to so current is equal to what charge over time this is the formula for what this is the formula for current so a formula that's summarize this whole thing is this formula we know that charge is equal to current times time so when you make current as the subject of the formula that's when we are coming up with this formula this is where the formula is coming from so when you make I the subject to the formula where we are dividing by T dividing by T so that we make either subject of the formula this is what you need to know and understand so these are the formulas that you need to know so there is a a specific instrument that is used to measure current what do we call that instrument what do we call the instrument used to measure current so what do you call the instrument used to measure current what do we call that instrument so that instrument used for measured in current is called amida so it is called the amida so anameter this is an instrument used for measured in current and it is connected in series so it is connected ammeter these points are very important I want you to know them and understand them Amita is connected so is connected is connected in what is connected in series so this one is connected in series so it is connected in series whenever you put down a circuit which we are going to draw later on you are going to understand what I'm trying to say so this one an ammeter must be connected to a component in what series this is what you need to understand the other thing is that the positive terminal which is usually a late terminal we know this that a positive determine we call it as a rate terminal so must be connected to the word positive battery terminal so a positive must be connected to a positive and the negative of the a negative terminal should be connected to the word positive terminal of the battery this is what you need to understand so you know that if if we are talking about an ammeter this is a positive cable and a negative cable like this so This positive cable should be connected to the positive of the word battery even the negative should be connected to the negative part of the battery so once you misreplace this that's when you come up with a short circuit you can cause damage so you need to make sure that negative is connected to negative positive is connected to positive this is how anameter is connected so I want you to understand this and I want you to get the concept that I'm trying to illustrate here so that we understand electricity these are the basics this is just the foundation we've started so make sure you understand this foundation so let us look at the a simple example now let's say you're giving an equation this is a question that you're giving a motor a motor uses so a motor uses a current so a motor uses a current of 20 amps have you seen 20 amps for 10 seconds this is what you're given then equation comes how much how much charge how much charge froze froze through it how much charge flows through it this is what you are giving so this is equation which is here the question is saying a motor uses a current of 20 amps for how many for 10 seconds how much charge flows through it how much charge you know that charge is equal to current times what times the time where you say charge is equal to six charge Q so charge is equal to what is your current your current is 20. then times what is your time your time is 10 like that so when you multiply here what are you going to get when you multiply these two what are you going to get so charge is equal to 200 Unity Capital C showing that it is what a coulomb so this is how you need to answer that question this is how you need to get this this is how you need to answer this question so away from this now there is also a part that we need to understand there is a specific part that we need to know and understand so you know that when we are talking about the voltage there is a part here when we are talking about voltage voltage is in do that is a type of a voltage which we call electromotive Force you need to know that so if this one is code we've got the first one which is called electromotive force it is called Electro Multiverse so it is called Electro motive force it says this is the energy so we are talking about voltage in terms of energy so it is called electromotive force and we usually call this as a m f this is how we get to call it so it is electromotive force so what is this electromotive Force what is Lily what is this electromotive Force what do you understand whenever you hear the term electromotive Force what comes to your mind what comes to your mind so what is electromotive force what is electromotive force so electromotive force is defined as the energy so this should come to mind this is defined as the word this is defined as the energy supplied so this is the energy supplied to so surprised to each to each column like that that is you current surprise to each column of charge within it to each column of charge to each column of charge within it of charge within it within it like this so this is what this is the definition of electromotive force which is EMF so when a question comes in your exams then you are told to define a question comes Define electro uh motive Force so what is electromotive force electromotive force is the energy supplied to each column of charge within it this is electromotive force so electromotive force is just the energy supplied is it is the energy which is separate so it has got its specific unit that is used so the unit of electromotive force is votes so the unit is what votes so the unit for this one is what don't forget the unit so unit what are the unit unit is what votes so the unity votes these are the units which is what votes so you know that whenever you are talking about votes uh according to this is electromotive force so you know that one vote is equal to so it is equal to what one Jaws per charge this is what we mean so there is also a specific formula that you need to know and understand that is a Formula that you need to get and understand whenever we are talking about these things so there is a Formula that you need to know and understand it is a Formula that you need to get you need to make sure that you understand that particular formula so under this what we are talking about under this what we are talking about is that electromotive also electromotive Force e m I'm going to do this F is equal to is equal to what what formula are you supposed to use so what formula are you supposed to use whenever you're told to calculate electromotive force is equal to what is equal to energy this is the energy energy over what over charge like this so this is the formula that we get to use where this one e e EMF is called electromotive Force which is in votes then the E there it is called this is the energy supplied by the cell which is in what energy is in Juice this is what you need to know and understand and then there is here this is charge so this is the charge flows the charge that flow through the cell it is in what it is like this have you seen so this is what you need to know and understand this is what we need to get so this is the formula that you need to know each time you are talking about that so I went from this now so we've talked about electromotive Force you know the definition you know the formula that you are supposed to use that is also what we call potential difference potential so it is called potential difference this one here it is called potential difference I'm going to do this potential difference and we normally call this as what PD we call it as PT which is the potential difference we call it as PD it is the potentiality potential difference so this is the potential difference so now what is this same potential difference what do you understand by this potential difference what do you understand by potential difference so this is just defined as the energy so this is what this is the energy this is the energy converted so this is the energy converted pay unit per unit charge so this is the energy converted per unit charge passing through so passing through a component so passing through a component it's easy what you need to know and understand have you seen the way I'm doing this so we are talking about what we this is what we are talking about this is what we are actually talking about which is potential potential difference then I've given this formula this uh definition of potential difference so and it's got it by charge from a cell or a battery so the energy carried by charge from a cell battery is consumed in in electrical electrical components like resistors you're talking about lamps we are talking about bulbs heaters of the circuit for example when the church flows through the bulb in a circuit their energy is converted so energy this energy that we are talking about have you seen the their energy is converted potential difference energy converted so their energy is converted their energy is what their energy is converted to Lighty or eat energy so their energy is converted to a lot of things it can be too right you're able to see light you're able to see it just like that so this consumed energy is what we are calling what potential difference across a what a component so whenever you you are talking about potential difference this is the energy converted per unit charge passing through a component so I want you to understand this and I want you to get all the concepts that I'm trying to say yes so that you don't miss any point you don't miss any point so the potential difference so the potential difference let me do this so that we are able to secret the potential difference is the SI unit or the unit for potential difference I'll say the unit for potential difference unit for potential difference is what so what are the units for potential difference also what votes like this this is what votes this is what you need to know and understand so let's make sure we get to this we understand all these stuffs that I'm trying to communicate so now what is the formula for potential difference so potential difference I can say potential difference I would say PD so potential difference is equal to so potential difference is equal to what this is equal to what potential difference is equal to what energy over the NH over charge this is the formula energy over charge but the energy which is here this is the energy converted have you seen But the energy which was uh in the electromotive force was the energy supplied but this is the energy which is converted to other forms in the component so then we are talking about a charge here so this chart this is just the flow this is just the attached through through the component this uh what we talked about this one is the same but this one since we are under potential difference and you say that potential difference is the energy converted have you seen energy converted per unit charge passing through a component this is what you need to know and understand so that is also a unit where we've got our instrument for measured in the water for measuring the we've got instrument for measuring this this voltage have you seen so we are talking about votes votes all of them they're what their their unit is votes their unit is what votes so there is also a specific instrument used to measure what votes and that instrument is code word this is what you need to know it is called voltmeter a voltimeter is an instrument used to measure the voltage so this is an instrument which is used to measure voltage it is used to measure voltage so a voltmeter must be connected across a component in a circuit which means that this will be parallel to a component this is what it means so I'm going to put down here a diagram which we are going to understand corrected and very well so maybe this one people are facing some challenges so uh when I'm done with this I'm going to put down a a free body diagram so that we know and understand how amitas and voltmeters are connected in a circuit I'm going to put down that diagram so that everyone gets to understand so voltmeter is measured in what is made is measured in what votes or voltage just one and the same thing since the use of the voltmeter this is what it is used so this one also the positive terminal we call it what we call it the rate terminal that's most of us uh whenever we're talking about a positive terminal we are talking about a red terminal so must be connected to the positive terminal battery so positive should go to positive the same thing positive should go to the positive of the battery the negative terminal which is the uh with this one we call it as a so this black should go to a black one so negative should go to negative positive should go to a positive this is a voltmeter this is a battery have you seen so now let me try to put down a diagram that will enable us to understand the relationship between these two the relationship between a voltmeter and the current so if this is easy I'm going to say this this is a battery here that is a battery so you know that current is being measured by an instrument called Amit then I said Amit is connected in series so in cities like this since where the ammeter is then if we move if we've got a lamp here if this is a lamp obviously this is a lamp which is here then it goes like this so where is the voltmeter going to be so voltmeter will be here the voltmeter will be here it is connected parallel to the word parallel to the resistor so this is how the voltmet will be connected but the ammeter will be in what in series so this is how the connection is supposed to be this is how you need to understand and get these things that I'm trying to explain uh with you so these are few things that you need to know these are few points that you need to get and understand so we are going to answer some questions together by the end of this we'll try to go through some questions we try to discuss some questions together we see where we are facing challenges we see where we need to we need to concentrate so much so all these formulas that have given you I believe you're able to apply them what is important is for you to know the formula once you're given the energy and the charge then you just substitute so substituting is very simple but what is important is the understanding a concept so the most thing that is important is understanding the concept so once you understand the concept then everything becomes easy so once you understand the concept everything will become easy so now let us now look at the other thing let us look at the other thing we look at uh the other thing here which is resistance so we go to resistance let us look at the resistance we move to resistance so what is resistance what do you understand whenever you hear resistance what is the resistance so resistance is just the opposition to the flow of current have you seen so resistance is just the word opposition so this is just the opposition opposition opposition to where opposition to the so opposition to the throw sees the opposition to the flow of current have you seen this is what resistance is so we also have the unit of resistance which is OHM so the unit what is the unit which is OHM like this then the symbol this is the symbol that we usually use like this one hope we are able to understand what Ohm's law is uh when we were doing primary school we were told to State this state Ohm's law we know that ohms roasted that the current flowing through a conductor is direct proportion to potential difference so we are able to remember all the all that Knowledge from our Primary School but here you just see we it can come but you just need to know because you passed that level so any level that you pass you're not supposed to forget especially in science Sans keeps on upgrading every day so what we are going to learn today tomorrow we are going to have an another information that will be more advanced so let's make sure that we don't forget what we learned because those things are going to help us so much so we are looking at what resistance and we've said that resistance is the opposition to the flow of current resistance is the opposition to the flow of what to the flow of current this is what you need to know and understand so some components in a circuit such as a bow bow it can be a heater it can be anything these are what we call resistance so a device which provides uh some resistance in the circuit is called a resistor have you seen so which means that those things like a bulb above as what resistance so since it is providing us some resistance so that bulb is called a resistor have you seen so I wanted to get this so if this is about we've got a bulb here if this is about this this is what this is about so above is providing us with somewhat with some resistance so this bulb is providing us some resistance so anything that provides us some resistance it is called what a resistor it is called a resistor have you seen or in other words anything that is using electricity is called a resistor so as we move on I'll be using this theme code resistor when you get this resistor this is the theme that I'll be using so let's make sure that we get this we understand this so what is the formula for resistance which formula do we use whenever we want to calculate resistance which formula are we going to use when we want to calculate resistance so resistance is equal to what voltage over current this is the formula for resistance you know that the formula for voltage voltage is equal to current times the resistance so if we make resistance the subject of the formula that's when we get to come up with this formula here because we divide both sides by R we divide both sides by R then we come up with this formula this is the formula that we get to come up with so I wanted to understand all these things that I'm trying to illustrate with you all these things that I'm trying to explain here so let me give you some questions uh let us look at some questions under resistance that we are going to revise together so let us revise through some questions which are falling under resistance let us look at some questions these are the questions that I want us to devise together there are about three questions which we are going to answer together so the first question is saying this is the first question which is saying a current of 2 amps froze through a conductor a conductor has a potential difference of two votes find the resistance of the conductor so find the resistance of the conduct so in physics it is very important to get the data so to get the data which is given what are we giving we are given current what is current current is two amps what else are we giving we are given voltage what is voltage voltage is 12 volts then in the question we are told to find what resistance resistance is equal to we know that resistance is equal to what resistance is equal to voltage over current where this one resistance is now equal to what is the voltage the voltage is 12 what is the current two so when you divide here what are you going to get 12 divided by 2 you get what six so the units these are the units so that is what that is your answer that's how you need to answer this question this is how you need to go about this question I moved to question two move to question two is saying find potential difference across a 1.5 ohms resistor when current of 4 amps flows through it so maybe you are wondering why in this question I'm told to find what I'm told to find the potential difference so as long as I'm not given charge those things you're not supposed to use those two formulas that we did so you are not supposed to use those formulas you are supposed to use this formula that summarize everything which is voltage is equal to current times resistance this is the formula that you be using but when you're given charge you know that okay energy divided by charge have you seen that's how we get to do it so now for me to answer this question it is saying find the potential difference across so I'm not to find voltage I told you that is very important in physics so what are you giving you are given what resistance resistance is what 1.5 ohms what else are you giving you are given current according to what this is the current you're giving it is four amps that's what you are given so with that one what are you going to do now so we are given these two these are what you are given so you know you want to calculate what voltage which is the potential difference so is equal to what the current terms resistance which is equal to what what is your current four times 1.45 so when you multiply 4 times 1.5 you're going to get six units votes this is your answer so this is how you need to answer this question so we moved to the last one let us move to the last question this is our last question so what are we thought it is saying find the current flowing through a 5 Ohm resistor that has 20 volts across it find current current is equal to what current is equal to voltage over resistance this is the formula for current so you put down now a what a data don't forget data what are you giving 5 ohms so that is resistance you put resistance what else are you giving voltage so those votes 20 votes then you substitute in the formula here we are going to say current is now equal to so current is now equal to what current is equal to what is votes what are the votes 20 over resistance 5 finally we've got four what are the units when you divide there you get four what are the units a so this is what you need to do these are the word answers that you need to find so these are the calculations that you need to put let's make sure that we understand all the calculations that I was illustrating here we understand all the calculations that I was doing so now the next thing that we are going to do now is how to draw now a security diagram some questions will be given on how to draw a security diagram so there are certain symbols that you need to know so I want to give you some symbols so we Face the look at what the symbol of electric components so same move forward symbol of electrical components so I'm going to give you major ones we who have quite a lot of them so just give you the major ones that we get to talk about we've got the major ones that we know so just need to know uh those major ones so the first one is what the first one that we get to talk about whenever you see something like this have you seen like this something like this if you see something which is like this just know that this is a resistor this is La this is a resistor you need to know that that is a resistor then we also have uh when you see something that is like this like this like this so then it is having something like this it says what do we call this this is an arrow that is an R what do we call this this is a word a Leo start please you start like this there is also uh what we call amida we've talked about the Army though when you see this something having a in it this is the ammeter you know what it measures it measures current I talked about it that is also voltage so the way it is like this then a v there have you seen like this this one measures uh votes it is called a voltmeter so this one is called a voltmeter so it needs to understand some of these things uh you already know them so you already know this so when you say something like this uh you've got something like this then this comes here like this then it moves like this this is a light bulb you need to know that this is the word this is a light bulb like this this is what you need to know so we've got a lot of things whenever I want to draw a cell like this if we are having something like this if we are having something like this this is a what this is a battery or what cells this is a battery or sales into understanding all these simple steps attempt we've got a lot of things as we get to move when there is a g or something like this then there is a g that is a galvanometer so that is how you need to know and understand these things so as we move on you are going to understand this property and only simple ones that we get to use in an exam so just need to know the simple ones the basics we get to use the basic so we just get to use the basics I've told you how ammeter and voltmeter are connected in a series those things you need to know them so just make sure that you know them just make sure that you understand so make sure you understand that you understand everything that you are given so that's how you need to answer that one that's how we need to understand that one so let's make sure that we get the concept let's make sure that we understand everything that I'm trying to illustrate here we understand everything that I'm trying to illustrate with you okay so let us move to something else so there is what we call a series connection and the parallel connection these are things that you need to know there's article a series connection and a parallel connection so let us discuss about this what is a series connection and what is a parallel connection see this connection let us talk about CDC connection so under series connection how can you know that this is a series connection how can you know that this is a series connection so a series collection will be like this you're given this is a sale like this or but like this have you seen so you can have these are resistors we've got a resisted a resistor there you move at least a resistor can be here have you seen so we've got these resistors are connected in what are connected in series so if they are on the same line like this so they are connected in what they are connected in series so these are connected in series this is what you need to know they are collected in series so in series you also need to know in terms of voltage so you need to know what voltage is you also need to know current this uh important things now this is where a lot of people start C confusing information so once you misunderstand me here then you are going to face some challenges on how to answer some questions under electricity so here now what can you how is the voltage and how is the word how is the current so what you need to know is that whenever you are talking about a series connection whenever you are talking about a series connection voltage is shared or different have you seen voltage is what voted is shared the other term that we can use for shared is different so voltage is different the voltage that is there is not the voltage that is there and not the voltage that is there voltage is different have you seen voltage is what different but current current is the same so you are going to understand this property when I bring up a question when we start going through questions when we answer one question from a past paper so this is what you need to know and understand this is how you need to get this this is how you understand this so This the voltage is what voltage is shared current is the same and how is the resistance calculated how do we calculate the resistance here how do we calculate resistance if you are told to calculate resistance I'll assume that this is 2 ohms this is 4 Ohms this is six ohms I'm just assuming so how do we calculate the resistance we say resistor one plus resistor 2 plus resistor three so you just need to add all the resistors you say two ohms plus four ohms plus six ohms what answer are you getting it is 2 of 12 Watts 12 ohms so this is the total total resistance so in series connection whenever you are told to find resistance you just need to add the resistors obviously so I've just added all these resistors but current current that is here current that is 0 current day is the same current is the same so I've told you how you can know voltage voltage is different so voltage that is there and voltage that is there they are different but current they are currently they are current there same resistance you just need to add all the resistors which are given this is what you need to know under this we move to another type we move to another type so the other type that we are going to talk about is a parallel connection this is a what a parallel connection a parallel connection this is what we are going to uh discuss some a battery what a parallel connection so a parallel connection is the opposite of what we did there so it is like this if this is a sale let's assume that this is a sale we do this so these are connected it comes like this it will come like this goes there even here like this is what this is a resist even here like this this is what this is a resist this is how it is so I'll just assume I'm putting these numbers so four ohms I'll just say this is for ohms this is two ohms have you seen this is two ohms then how is the voltage here so under parallel connection voltage is the same voltage is the word voltage is the same I want to be understanding these voltage is the same how is the current how is the current how is the current how is the current you understand what current is how is current in a parallel connection current is different or shared so is what shared current is shared current is shared so these are simple things that you need to understand these are simple things that you need to be getting so I've talked about voltage voltage the voltage that is there is the same voltage that is there the current that is there is different to the current that is there this is so what if now you are told so you are told let us uh look at this question you are taught to find the total resistance there so how do you calculate the total resistance I want you to hear me and hear me well so here now what do we do is this one this is the formula one over total resistance is equal to one over resistor one plus one over resistor 2 plus 1 over resistor 3 plus you are just going it depends with the number of resistors that you are having this is one over this is one over have you seen one over resistor one plus one over resistor two plus one over resistor three this is the formula that we get to use I want you to hear me well on this one this is a part where a lot of people make mistakes we get to make a lot of mistakes on this part when calculating resistance which are in uh parallel so this is the formula I'm going to give you two formulas the other one is uh the other one is the conditional you apply that on a specific condition but this one this is a general formula once you know this even if you don't know the other one you are good to go so it needs to make sure that you know this make sure that you understand this simple part that I'm saying here so what I'm actually saying this is what I'm actually saying so here what you are going to do is that you are going to how many resistors are we having two so the formula will just have two resistance so say 1 over total resistance is equal to 1 over resistor one what is your resistor one resistor one it is a four that is there so four plus one over what is your resistor 2 you just keep pick that one you say it is what it is to this is what you're going to do then you are going to maintain this one one over total resistance which is equal to what is your common denominator here it is four have you seen you say four into four it is one one times one it is one plus two into four it is two two times one it is two so I'll get the same one I'll say 1 over total resistance is equal to we've got three over three over four that is what we are going to have one over total resistance is equal to three over four this is the part which is e have you seen so here you cross multiply cross multiply you say three times RT we are going to have three r t which is equal to 1 times 4 we're going to have a four you divide both sides by three you divide both sides by three so this and that will be canceled what are you going to have you're going to have total resistance is now equal to so when you divide here what answer are you getting when you divide what answer are you going to get so when you divide what answer are you going to get so when we divide here so I'll divide this make sure you participate in this make sure that you participate so I'm waiting for you to tell me the answer so divide what answer are you getting simple calculations 4 divided by three it is what you're going to get 1.3333 have you seen it is just going to be 1.333 just like that so 123 3 just like that so I can say 1.3 then I put what Ohms this is how I calculate total resistance this is how you need to calculate the totality the total resistance in a circuit this is how you need to calculate this so these are simple uh things that you need to do make sure that you understand all this you understand everything that we are saying make sure you understand this so make sure you get all what you need to get so with this now let us look at one question then we close this lesson let us look at one question which we are going to do hope this is helping new device through electricity this is a part that mostly confuse people so this will come in your exams I'm really sure you're going to see one or two questions under this part so make sure you understand this part you get all the necessary Concepts that you need to get I'm making this very simple I'm making this very simple so that you understand so that you understand and get uh the concept here so let us look at these questions so we've got this question here this is question one that we are going to discuss together we are going to answer this question together so it's saying consider the circuit diagram below so the consider this circuit diagram so this is a circuit diagram which is here below so this is the circuit diagram I'll go straight to questions find total resistance these are connected in what these are connected in series so total resistance just say total resistance so question a total resistance you just add resistor one plus resistor 2. those are the two resistors which are given so you add them one plus three is equal to what four ohms so this is your totality total resistance you are done you move to the other question so B you move to the other question the question is saying current through the sale current is equal to what how do you calculate current so how do you calculate the current current is equal to voltage over the voltage over resistance this is what you are going to do voltage over resistance which is equal to what is your voltage voltage is 2 there as you can see we've got a 12 volts there so 12 over what is your resistance for then what is your answer when you divide here what are you going to get 3 amps this is your answer just like this then you move to C the potential difference of potential difference of what this is what you want to calculate them potential difference of one ohm resistor so one ohm resistor okay one ohm resistor I'm told to calculate the potential difference of one ohm resist because I know that the voltage that is here is different to the voltage that is there but current is the same the same current here which is 3 amps is the same current that is there and it is the same current that is passing there why because these are connected in series so I'm going to use this same warranty current so voltage is equal to current times resistance where I'm going to get this I'm going to say voltage is now equal to 1 ohm resistor so current what is my current current is 3 amps have you seen so 3 amps like this current is 3 amps times 1 ohm have you seen so which is equal to so when you just say 1 times 3 which is 3 watt three votes so that is the those are the votes which are there this is what you need to understand so the votes that are passing through this one um this one uh this one only exist this is three votes then the last question they are telling us to calculate the potential difference of 3 Ohm resistor 3 Ohm resistor 3 ohm that is there so it's a voltage is equal to I go to this other one the last one this was C this is the D so I moved to the D voltage so I know that current terms resistance which is equal to current same one three times resistance it is what three 3 ohm resistors so resistance it is three they are specifying that I calculate resistance which is there so here what I'm going to do is that voltage is equal to 3 times 3 9. so 919 votes so this is the votes that are passing through the 3 ohm resist so this is how you calculate this equation this is what you need to know and understand so this is question uh one that we've covered so these questions come in your exams so make sure you understand this you know the basics you know everything that it comes in an exam this is according to examination standard so wherever you are watching this video from know that these questions come in you exams this is electricity so let's make sure that we know this we understand these simple techniques that I'm showing you let us move to question two our question two it's easy question two so as you can see this one is having resistors connected in a parallel so these are connected in parallel we've got the first question from the knowledge that I've shared you are able to calculate the total resistance when these two are inward when these two are in uh parallel so the reason why I didn't give the face the the second formula is because I don't want to confuse anyone let me give this General one because it is the same one that you can apply on every question so the first question total resistance how do you calculate the total resistance you say 1 over this is what you're going to say 1 over 22 resistance is equal to 1 over resistor one plus one over resistor 2 we're just having two resistors so this is what we are going to do then I say 1 over 22 resistance is equal to 1 over I've got one over one so I'm just going to do this press one over three this is what I'm going to do then I know that 1 over 22 resistance is equal to here so if I evaluate that so you can use a calculator that is one plus uh one over three what answer are you going to get so what answer are you going to get there what answer are you going to get here so what answer are you getting which answer are you getting on this part what are you getting on this part so we want to see how we can answer this one so here what you are getting the answer that you are going to get you discover that here when you add this part you're going to get 4 over what over three that's what you're going to form when you add this you evaluate then you do all the calculations common later you find four over three you do what gross multiply so we cross multiply this would be four total resistance is equal to three then you want to find total resistance you divide both sides by four even here you divide by four so this and that canceled so total resistance is equal to so when you divide there what are you forming 0.75 ohms this is your totality total resistance this is how you find the total resistance so we've answered the question a this is how you need to answer question a I move to question B how is question B question B the potential difference of one ohm resistor have you seen the way this question is they want you to find the potential difference of one ohm resistor so what is the potential difference of one ohm resistor so that potential difference of one ohm resist I told you that the voltage that is here it is the same voltage that is there because these are connected in what these are connected in parallel so here 12 votes so even here we've got 12 votes even here we've got 12 votes because these two are connected in parallel so what is your answer there what is your answer what answer are you getting so the first one here it is worthy you are getting 12 votes that is the two votes even here it is what 12 votes so we've answered even C so this is how you get to answer such a question then we move to this question here which is saying current through what three Ohm resistor current that is passing through there the current that is passing through there so how can you calculate the current that is passing through there so the current that is passing through there you know that there what you're going to do is this so we are on D we are on D so on D you are told to calculate current that is passing through the 3 Ohm resistor so the current that is passing through the 3 ohm resistor you know that current is cost voltage over the resistance which is equal to voltage is 12. Resistance 3 ohm resistor so three so current is what four amps have you seen this is the current which is what four amps this is the current that we are having this is how you calculate you move to e let us move to e so on E what are we thought the current passing through the word current and current through one ohm resistor same formula you are going to say current is equal to voltage over resistance voltage it is 12 over over resistance resistance 1 ohm resistor have you seen one ohm so one what is your answer there the answer is 12 amps like that you are done that's how you are supposed to do it then you move to the other part the last one which is saying the current through the sale so if your thoughts together create the current through the sale so current is equal to so here we are just saying four plus two four plus so four plus twelve what answer are we getting the answer that you are getting is what 16 amps so this is the total current in the circuit as you can see the current that is here the current that is at 3 Ohm resistor what did we calculate it was 4 amps the current that is there was what 12 amps showing you that current is different but voltage is the same voltage is the same so these are terms that you need to know and understand so this is what you need to get and understand so with this information you are going to answer exam questions this will help you handle and understand the exam questions thank you so much don't forget to like do forget to comment don't forget to subscribe to my YouTube channel this is my official YouTube channel thank you so much [Music]