[Music] right good morning grade 12 and Welcome to our uh first Theory module for this year so this is module 1.1 computers in our everyday lives and we're going to be looking at why we use computers and the type of computer system so a lot of this is going to be um revision but remember now for grade 12 we are actually combining um grade 10 11 and some new work in grade 12 so always be revising on those things we're also going to look at the different categories of users and this lovely term that comes up every now and then convergence okay so why do we use computers we've gone through this in grade 10 11 all already um we use computers because of three things efficiency accuracy and reliability so we know know that with efficiency it helps us save time labor resources it's more accurate it's more reliable um it assists with communication as well because it enables us to eliminate time and distance issues you know in terms of businesses it allows us to communicate and share information in many different ways globally save on communication costs and interact socially on a worldwide scale and we can see through the various social media platforms how communication has been impacted by this now we also know that we have different types of computer systems and again we have spoken about this but now we need to look at it in a slightly different manner when we are comparing devices so if I'm looking at my smartphone if I'm looking at a hybrid device if I'm looking at a desktop there are things I need to look at and questions I need to ask for example how powerful is this device what is the device going to be used for what is the size what is the software that I need to use so for example if you are going to be buying a laptop then you need to ask yourself okay well number one what is it going to be used for am I using it to connect to a network am I using it for gaming am I using it for video editing am I using it for basic office applications now the minute you answer that question it's going to help you decide on the size it's going to help you decide on the hardware specs and it's going to help you decide on the software that you need because if you're using it for gaming you need a lot of ram you need a strong CPU and a fast CPU um you would want a fairly large screen and there specific software that you would want on there as well so um these are questions we need to ask and this relates to laptops desktops smartphones all of those things we have our non-portable computers now remember when we spoke about portability we spoke about the fact that it uses a battery so our non-portable computers like our desktops they are not meant to be moved around they are large they are generally more powerful than the portable computers and uh some of them are even allinone units but they plug into the wall and they get the power from that okay your laptops um tablets Etc they do take up less space than this but they are more difficult to fix and upgrade now two examples are your desktop computer and your server and then you get something called an entry level computer now this is a term that comes up very often and what it's basically saying is that within that particular category of computer it's the cheapest to purchase in that range it's got lower Hardware specification so um a slightly slower CPU maybe some less Ram so instead of having 8 gigs of RAM it might only have 4 gigs of RAM and even the software that it has in terms of its operating system um they usually have home editions okay so this is an entrylevel computer right please know that for your tests and exams um our portable computers this again we know we know it's got an all-in-one design everything is Incorporated in that case it's designed to fold to be easy to carry to protect the various parts so that's not an issue um we've looked at in the grade 11 modules the different types of portable computers as well but this is something that is very important now with your computers um they are built with a modular what we call a modular design so you need to understand this term this means that the computer you buy can be put together in pieces with your requirements in mind instead of consisting of a single unit in which all the hardware is fixed okay smaller Technologies like your laptops and smartphones are less modular the parts are not easily replaceable so if we look at the motherboard of a desktop computer here we've got our ports that are bolt into the motherboard this is where our CPU goes this is where our memory goes um our expansion slots Etc so what they're saying with a modular design is that if I don't want that particular CPU if I want a faster CPU and it matches with a motherboard I can take this one out buy another one pop another one in if something goes wrong with the memory I can pop out the memory buy memory or new memory and then put it into these slots if I want to change my graphics card I can do that and as well now our laptops and our smartphones don't always allow in fact your smartphone I mean number one doesn't allow you to do that um your laptops give you limited options so like the hard drive and the ram can be done um and RAM is usually the one thing that people change a lot on the um laptops but you also have to cater for the motherboard and find out how much RAM that motherboard can actually handle so uh that's what is is meant by a modular design then we have head-mounted displays and this is where our virtual reality and augmented reality comes in now please remember the big differences our virtual reality we're putting on whatever headset it is and it gives us a completely digital environment right we are in a whole different environment with virtual reality augmented reality we still see the the real world with digital information overlay so when I've got these specs on I know um Apple came out with something regarding this you can still see the real world but you've got digital content that is displayed over that as well so our head mounted display that is worn on the head or embedded in a helmet with a small display for one of both eyes this can to be used in gaming and Aviation um and our augmented reality creates any effect of digital content interacting with the world as as I mentioned and then we've got our virtual reality as well so please if you see this term head mounted display hmd please understand what they are talking about okay we also have our drones now they might not always use the term drones in some cases now they are going to use them they might use the term unmanned aerial vehicles but that's an older term but just I want want you to understand both so you don't get confused these are aircraft devices that fly above the ground and are not piloted okay um there's a number of things that they can do some of them have cameras some of them can you know pick up um items as well I know Amazon had an ad where they were delivering um Parcels with drones so interesting right then we have something that is very important to the grade 12 cat Theory syllabus which is your category of users now we have about four different types of users the first of which is a personal user this is someone who does limited office tasks little bit of internet banking email and browsing social networking maybe some Skype with friends viewing and sharing photos and you know using the device really for entertainment as well that's just a personal user a lot of people fall into this category then you have your Soho or your small office home office user now this this depends on the type of business the user runs but generally for a small office home office user you have entry level you see there's that term again entrylevel computers for admin functions like accounting databases of clients electronic document archiving um and planning and scheduling right so that's really what a Soho user does and again I'm going to emphasize on the fact that they generally use entry level computers then we have our power users and these are the guys who are going to use the top of range hardware and software so you're going to talk about hardcore Gamers video editing professionals Engineers scientists Architects all these types of people um because they require Hardware that's more processing intensive in fact they are using software that requires more processor in uh intensive Hardware um so yeah just understand the difference between those that's was now our personal user Soho user and our power user and then we have the mobile user they want and need to have their technology with them wherever they are they use a smartphone or tablet for any of the following browsing the internet playing games reading books navigating with GPS taking quick notes uh maybe taking photos video recording sound as well so a lot of people fall into the personal user there are those who fall into the mobile user as well there are few that fall into the power user and then you've got your Soho user um for those doing business from home or business on the go as well so that's important because that usually comes up in the form of a scenario where they'll ask you what type of user is the scenario referring to Etc then we have our last slide dealing with the term of convergence you must know this term and be able to explain it this is something that does come up as well this is the trend where separate Technologies so separate Technologies and functions that previous required what different devices as you can see they are now combined into a single device the smartphone and tablet are good examples of convergence and folks that's it for module 1.1