Grade 12 electric circuits and electrostatic revision

Added: 2026-05-23

[00:00:01]really really nice because I don't know why I You don't me.

[00:01:00]problem.

[00:01:11]What woman are you talking about? Which woman?

[00:01:17]Yes, ma'am.

[00:01:32]Why should you wait?

[00:01:52]Guys, um I'll put and then everything the fire emojis, please. Just do the emojis.

[00:02:56]Okay, shop guys.

[00:02:59]Um, now with that being the case, um, I want us to look at, um, just want to make sure that everything is there.

[00:03:31]Okay. Um, now with that been the case family, can we just wait for others just a small bit and my laptop is giving me headache.

[00:03:42]Um now with that being the case again um tomorrow's class is class will be at 3:00 not 3:00 sorry the normal class tomorrow will actually be at what at 3. So I know most of you guys tomorrow are going to Taptoza.

[00:04:05]Um I know most of you guys are going to Taptoa. So please immediately immediately and immediately immediately after leaving Tabo Togoa please come to Tetang as fast as you can. I repeat again when you leave Tabtoa please come to Detang as fast as you as you can.

[00:04:28]um which will be at half which will be at about at around 10 because you guys are leaving those classes. They said 4.

[00:04:38]Did they say four guys? Did they say first two or four or five? What time are you guys leaving tomorrow?

[00:04:54]So guys, what time are you guys leaving Taptoa tomorrow? 3:00. Oh, 3:00.

[00:05:02]So if they said it's 3:00, uh, that's good news for us.

[00:05:24]So I want us guys to start with what we today we are just going to mark we just going to mark the work that I sent you guys um which will be what which should be on electrothetics.

[00:05:43]So family we are going to be doing what elect what electrothetics.

[00:05:49]Um, I just want to make sure how many people are watching.

[00:05:53]Can I just see how many people are watching?

[00:06:01]Just want to do this.

[00:06:08]So guys, I don't know. My laptop was ready, but I don't know. It's acting up right now.

[00:06:16]But I'll try my level best by 10:00 that we are done. I repeat again, I'll try my level best that by 10:00 we are done. So 1 hour I think will be enough for those two questions.

[00:06:32]I think 1 hour will be enough for those two questions. So just that my laptop it's acting up bit slow right now.

[00:06:42]It's bit slow.

[00:07:06]H guys, my L is trying to act up. Can I just fix this a bit?

[00:07:18]Not sure if that would be okay.

[00:07:47]Just a bit.

[00:10:15]Okay. Shis.

[00:10:18]Um so let's start working. Um our first one our first one is that um we have um something like this. It says this is R which is positive 9 microo and then we have what we have five which is sphere S at5 microo the diagram below shows two identical metal spheres RNS placed on each insulated what stand So family they say these are insulated stand right now. Now now that being the case here R and S are brought into contact with each other and then are placed 30 cm apart from each other. Family what does it mean? It means they are made to touch each other.

[00:11:26]They are made to touch each other.

[00:11:31]So if they are made to touch each other family, what is the process? What is the name of the process that will take place once they touch each other? Can you please write it in the comments there?

[00:11:45]What is the name of the process?

[00:11:49]What is the name of the bosses that will take place when they are made to touch each other?

[00:12:01]Sphere R and S are made to touch each other. Once they touch each other, there's something that will happen. What is that process? Um says the force of attraction.

[00:12:13]The process. The process. Attraction.

[00:12:19]Attraction.

[00:12:21]Says it's attraction and then attraction cuz remember it's last year's word family and then it's going to appear the same. It's going to appear the same right now. Transfer of electrons. Kra.

[00:12:41]What is that name? I'm not saying what will happen. We know family example we know that this one is positive and then we know that this one is what negative.

[00:12:50]I'm not asking if they will attract or repaired. I'm not asking that. I'm saying they are saying to us they are made to touch each other and then when they are made to touch each other but that's when they made to touch each other there's something that is going to happen. Cath says what a transfer of electrons. Now I want you to tell me what is that process where the electrons are what are transferred. What is the name of that process? What is the name of that process?

[00:13:26]Polarization.

[00:13:29]KCD you are correct. That process is called what?

[00:13:34]polarization or what we call quantization the processes are called that it's called polarization or it's called what quantization what is going to happen family once they they say to us they are made to touch each other these two they no longer exist they no longer exist. What do you have?

[00:14:06]They say after they are made to touch each other, they are there. They see to us they are then separated by what? By a distance of what? Of 30 cm. This is R and then this is S. Family. I repeat, I repeat, these two charges they no longer exist.

[00:14:29]They knew as okay if this if they haven't touched each other this is positive 9 this is5 but once they touch each other once they touch each other positive 9 and5 they exist what exists what exist is the new charge there's a new charge which is the process of what of quantization so they say to us calculate the charge of each sphere Immediately when they are what they are separated what is the formula for when the charge touch each other. So 7.1 7.1 they say what is the new what is the charge after they made to separate after they have been separated. What is the formula Q= Q1 + Q2?

[00:15:23]This is the formula for when the charges what touch each other. Then my answer is going to be what? My answer is going to be um remember this is which is -6. So it's going to be 9 * 106 plus open market what 10 -6 and this is all over what? 2 and then how much is going to be 5 into 9 - 5? It's 4 / 2. So my answer is going to be + 2* 10.

[00:16:01]What does this mean? What does this mean? This means this charge this charge after separating this charge is now two.

[00:16:09]And in this one it's also two. Both of them are now what? Positive. and identity.

[00:16:18]Can I ask a question? Is there anyone who has a problem that process you can just type it out?

[00:16:30]Is there anyone who has a problem with what I just did right now?

[00:16:37]Is there anyone can type the question?

[00:16:45]You can type the question if there's any question any question how can it be how can it be polarization how can I don't understand the question what what is your question I'm lost the how can it be polarization.

[00:17:15]Oh, I'm lost a bit.

[00:17:21]I'm lost a bit. How can it be polarization? We call it We call it polarization. Remember why do we call it polar polarization? This one is positive and this one is what? It's negative.

[00:17:35]Okay. So, what's going to happen when they touch each other? There's a transfer of what? Of electrons. When there's a transfer of electrons, what happens? After touching, they are what?

[00:17:44]They are now what? Either both positive or they are both what? Negative. So polarization is a process where the the process is making these two charges to be what? Both positive or both what?

[00:17:59]Negative. As in polarization, when an object is charged is charged and the other one isn't, then they come into contact and then the charges move. Is Isn't that polarization? You are correct. You are 100% correct. But polarization is not limited to that. It's not limited to one charge being no. What happens is polarization simply means these two charges are making their poles. Remember simply means what?

[00:18:34]Polarity polarity. Okay. So polarization simply means what? The process. This is a process where both of these charges are what are making each other to what? To be identical. Another specific term for quantization. But what happens is that it's simple. The two charges are making each other's p to be what? To be the same. They either both they're either making each other both to be negative or they either making each other to be both what? Positive.

[00:19:08]This that is the the where this thing comes from sharp. Then the following question the following question it says draw the resultant electric field pattern due to sphere R and S after separation. They are saying draw the what? draw the electric field after what they have touched. Remember after touching this one is now what? This one 7.2 this one is now positive and this one is now what also positive. Now what happens? They are now repelling each other. So this one will look this direction.

[00:20:02]What? Both charges are pointing away from the positive. Remember I repeat guys, the charges are supposed to be pointing what? Away from the positive.

[00:20:15]Any question on that one?

[00:20:18]Remember before they touch guys? Before they touch, before they touch. Before they touch, it would have been positive.

[00:20:25]Negative. This would have been what?

[00:20:45]Guys, sorry. I'm just asking but before they touch they would have what they would have attracted before they touch they would have attracted to but once it det once they touch each other only what happens is that they are making the polarization takes place each poles are now what identical after they identical the other one has to move to the left the other one has to move to the right because now they are like charges where they have to what they have to repel now okay Because they are now what? Like charges.

[00:21:19]Any question?

[00:21:31]>> Any question for me that any question?

[00:21:42]>> Any question for me?

[00:21:45]Okay, no question. Sharp. Then they say to us, then they say to us, we now have sphere R.

[00:21:58]I get we now have sphere R.

[00:22:01]Now we have sphere T.

[00:22:05]And then now we have sphere what? S.

[00:22:10]And then they say the distance between this one and this one is now 10 cm.

[00:22:17]And this the distance between this one this one is what is now 20 cm.

[00:22:22]And remember they said the distance between what? The distance between R and S is now what? 30. Basically 30 is now 30 cm. 30 cm. Okay. Now if the distance is now 30 cm they are now taking what?

[00:22:38]Another charge. This another charge is what? is now placed between them between R and S.

[00:22:46]It's placed 10 cm away from R but 20 cm from S guys.

[00:22:56]Now if if if you know the magnitude if it's right magnitude if you know the magnitude of the three of them I repeat guys if you know the magnitude of the three of them you know all of their magnitude you know the magnitude of sphere R you know the magnitude of sphere T then you know the magnitude of sphere S they going to say calculated the net force you can only calculate the net force when you have calculated when you know what the three of them but Guys, if you know two of them and you don't know one of them, I repeat again, if if you you are given three charges and you only know two, you don't know one one of them. That means the net electric field, they what? The net electric field, not the net force. Does that make sense? I hope it makes sense.

[00:23:48]The first question to ask remember this is this is two.

[00:23:59]This is two.

[00:24:05]This is two guys. I repeat 952.

[00:24:17]Those two The rest they are not there.

[00:24:24]This was the norm exist. The question says what after R and S have been brought into contact and separated the third sphere the third sphere which is T T which is has a charge of what? It has a charge of what? Of one mic + one. So they say it has a + one micro charge is now placed between them as shown in the diagram below. Calculate I repeat guys. We know the three of them. We know this one. We know this one. We know this one. If we know the three of them, they going to want what? The net force. If we know two, they're going to what? But they're going to want what? The net electric field. Five for five marks they say to us 7.3 calculate the net electrostatic what force calculate the net electrostatic what force how do you calculate the net electrostatic force before you do anything you draw the free body diagram before you draw the netic field you need to draw what the electric field okay so they said to us calculate the net you want the They want the net force by by what? By t by t by t to r and s.

[00:26:10]What does that mean? The most important one is this one. For me, they want you to to calculate what the net the net electrostatic force by T on R and S or they can put it in they can say calculate the netic field strength the net the net electrostatic force by T by RNS doesn't matter but netic by what by T by T by T right we need to calculate what we need to draw the diagram first so T this T cuz the one that is our our point of interest we are going to represent T as what as a dot now when we represent T as a dot we are going to ask ourselves this question the first one the first question that we are going to ask ourselves is T is the one that is so T is the one that is going to I repeat again.

[00:27:28]So rememberitive.

[00:27:39]The three of them are positive.

[00:27:44]You are going to hide this one, guys.

[00:27:46]You hide this one. You hide this one.

[00:27:49]You only focus on the two. You focus on R and what? And T. Guys, can I ask you I want to ask you, I I want you to type all the comments there. What is going to happen here? If this one is not there, this one is not there. Are they going to attract or they're going to repair? Fast fast. I'm only giving you guys 10 seconds.

[00:28:13]Guys, these two R and T, forget about R.

[00:28:17]R and T, are they going to attract or are they going to what? To repair. This is R. This is T. Is this these two?

[00:28:26]These two, are they going to attract or they going to repel? Which says repel?

[00:28:33]Repel.

[00:28:36]Repel.

[00:28:38]Lindo. Repel. Mumo. Repel. Can you select repel?

[00:28:47]Says repel.

[00:28:51]And guys, these ones not moving.

[00:29:00]Not moving.

[00:29:02]Not moving.

[00:29:06]This one is the one that is what? That is moving. Sharp. And then how many people do we have on our channel? Can I look? Can I see and look?

[00:29:30]14 people. It says 14 people are watching and I'm only seeing 2 4 6 7.

[00:29:41]What replies guys? I'm only seeing it says 13 people are watching and then I'm only seeing what? I'm only seeing seven responses.

[00:29:55]Seven responses.

[00:29:59]11 people are watching but it's fine sharp. So guys if if they are repelling and guys these two are repelling each other.

[00:30:15]So this one is pushing this one.

[00:30:19]So R is pushing T away from itself. It's repelling. Therefore, can I ask is is can I ask remember this one is the one that is moving not moving moving. So is this one going to push this one to the right or to the left? Can I ask You said they repeating. Remember they repeating. So can you please type right now? Will this one move based on this one? Will this one move to the right or to the left? Lindo says to the right says to the right.

[00:31:23]Um going to the right to the right.

[00:31:39]To the right remain there.

[00:31:50]Okay, the answer is this one because they are repelling because they are repelling each other. This one will repel this one. Therefore, pushing it to the right and right S. So the answer is to the right.

[00:32:29]Now guys, we are done. We are done with the first one. We are done with the first one. Guys, I repeat, we are done with the first one.

[00:32:38]Sh. We go to We now hide this one. Guys, we now hide. Please stop focusing this one. This one is no longer there. This is now S.

[00:32:50]R. We now need to focus with what with TS RT. Sorry, RT. Sorry, it's RT. So, we're going to focus we we did RT. Now, we focus on what? On TS. I repeat, we are done with RT. We now focus on TS.

[00:33:09]Remember, this one is the one that is moving and this one is not what is not moving. Okay. Again the question I need to ask you right now based on these two forget to check out these two will they attract or will they repair? Guys between these two and this one both positive will they attract or repair?

[00:33:29]Please type first will they attract or will they repel?

[00:33:34]Will they attract or will they repel?

[00:33:41]Repel. Repel. Repel. Repair, repair, repair. I agree with you guys. These ones are going to what are going to repel? So, this one is going to repel this one. So, I need to ask you and based on T is is S S is S guys, is S going to push T to the left or to the right?

[00:34:06]Now, I want answer left or right. Will T push this thing to the left or will he push it to the right?

[00:34:14]And here we see the rep. You saying these two are repeating. So this one will push this one to the left or to the right. Horizan says left, left, left, left, to the left, to the left, to the left, to the left. And yeah, to the left. I I carry with you guys. It will push this one to the left. This is now what? T S.

[00:34:40]So you are you guys are correct. So this is what to the left. So the it means guys they are in opposite what direction?

[00:34:52]They are in opposite what direction? So your Fnet after doing this your Fnet guys FN how? Your fnet is now fnet is now equal to you're going to say you're going to say whichever one you want guys but please please start with the what with the one that has a smaller distance guys which one has a smaller distance between the two which one has a smaller distance between the two and r is 10 cm while ts is what it's 20 cm so I adise you start is the one that has a smaller distance which is RT. So see this because they're in opposite direction you going to see what you're going to say f of rt the force of rt which is this one the force of rt minus the force of t s guys I I hope you understand by t or on t by t or Let the letter repeat itself what? twice please then when it's like this guys it's very very easy after doing this then you see what then you see what guys remember this is what force which is force forceative K Q R Q T over R 2. Then you say - K Q T Q Q S over R².

[00:36:48]Can you see that? Why are they subtracting? Why are they subtracting?

[00:36:54]Because these two forces are in opposite direction. The other one is to the right while the other one is to the left. The other one is pointing to the right while this other one is pointing what? To the left.

[00:37:14]Because they pointing what? In opposite direction. Therefore, they what? They going to subtract each other.

[00:37:41]shop.

[00:37:42]So good.

[00:38:01]Okay. Now we substitute. When we substitute, we're going to see what we need. We are going to say 9 10^ 9 * 10^ -6 T 6. Then the distance we now want what we now want the distance between R and T.

[00:38:32]What is the distance between R and T?

[00:38:34]It's 10 cm. Okay. 10 cm. We don't work with cime with meters. So we going to divide that 10 by what? By 100. So our answer is going to be what? Our answer which is going to be 0a 1 2.

[00:38:53]Then who is this?

[00:38:58]Because they moving in what? In opposite direction. Thank you guys.

[00:39:08]Thank you guys. Okay.

[00:39:12]Um then guys guysit I guess what? Rinus.

[00:39:42]Then we come to this one. And then this one 2* 10 what? 6. This is all over the distance between what we make the distance between T and S. What is the distance between T and S guys? What is the distance between T and S? Keep 20 cm 20 cm. So what is our distance? Our distance will therefore be what? Be 0 2.

[00:40:16]Then you subtract them on your calculator and that will be your final answer.

[00:40:23]That will be your final answer for it.

[00:40:25]Any question?

[00:40:28]Any question?

[00:40:30]Any question?

[00:40:38]Any question?

[00:40:43]If they were unlike charges, yes.

[00:40:49]The answer is what? Yes.

[00:40:53]Whether they are like charges or unlike if they want net force, please draw the free account. So that guys can listen.

[00:41:20]So, why why do we need the frequ if they were pointing in the same direction? I would say plus. If they were both pointing to the left, if they were pointing both to the right in a plus, but if the other one is pointing to the left and the other one is pointing to the right, then we have to what? We have to subtract them. Thank you guys. I'm not going to define electric field at a point. It's your job that E net on T by R N that's the question which is 7.5 guys 7.5 calculate the net electric field at the location of of T by R and S.

[00:42:52]Very very simple for me. Very simple.

[00:42:54]Very simple.

[00:42:59]F is equals to E.

[00:43:08]Which one? The one that we interested in.

[00:43:29]I'm just making an example. Let's say our 20. I'm just making an example.

[00:43:34]Let's say our in was what was 20 in expressed by what? by t. This is your formula the first one. Then you see what you say 20 is equals to e. Then you put what the charge of the what? Of this one. You see 1* 10 206.

[00:43:58]Then you answer 20* 10^ of 6 Newton per which is three marks and that's your mark.

[00:44:21]Take that.

[00:44:24]Take that charge.

[00:44:44]Then this is three marks. Any question for me?

[00:44:50]Any question?

[00:44:55]Any question?

[00:45:04]We are done. question and if there's no question we are done by question seven.

[00:45:09]If there's no question, we are done.

[00:45:11]Question number seven.

[00:45:25]Any question for many?

[00:45:28]No question. Thank you.

[00:45:34]30 minutes we were able to do within 30 minutes. I will try my best to make sure I will try my level best.

[00:46:24]We Let me zoom.

[00:46:47]Uh this 8 ohm resistor V2.

[00:47:50]The MF2 volts are internal resistance.

[00:48:09]40 vol 12 vol okay I tried my best guys with a can I just Look, you just want to see something. I just want to see something.

[00:48:45]Uh, guys, is it better like this or is it not better like this? I'm not sure.

[00:48:52]Is it better like this or is it not better like this?

[00:49:05]First light.

[00:49:14]Better like this others. Is it better or not? Better like this light.

[00:49:44]It's bit darker now.

[00:49:56]light. Okay. Ask.

[00:50:04]Okay. Then if light I'm fine with it. Um if light you are fine with it. I just wanted to make sure that whatever I do it benefits you guys. Ah sharp sharp sharp sharp. Our biggest problem number one diagram below the second diagram below shows a battery with an emf of what of 12 volts emf 12 volts guys what is emf emf guys do you see that is now a beta Guys, this is not the bed.

[00:50:51]Yeah, I know. This is not debate.

[00:50:56]I repeat now. That is our battery. Now this is now maybe sells it too.

[00:51:20]This is now the internal resistor. This is the this is the resistor inside the battery.

[00:51:30]I repeat this is now the resistor inside the battery.

[00:51:37]So if resist because this is the what the internal resistor. What is an internal resistor?

[00:52:10]the resistor inside the guys. That's the first resistor inside the maximum the maximum voltage.

[00:52:39]I repeat, EMF get the maximum voltage.

[00:52:45]Isn't a battery two or more cells combined together? True.

[00:52:51]True. But combined how? Those two batteries or those two cells you are assuming that they have what? You are assuming that they have the internal resistance.

[00:53:08]That's all. So in grade 10 or 11, we would say to you in grade 10 11 would say ignore. We would even say ignore the the resistance of the what of the why did we say ignore? We said to you ignore in 10 or 9 or do this guys and then we say this is a we are not wrong. You are not wrong. This is a but if you ignore what the internal resistance this is the bit. If you ignore the internal what resistance I I can but once you go to grade 121 now this one this one this one is now what is now the internal resistance which is the resistor inside the inside the we are now showing it to say so how can it be outside How can it be outside this one? It can't be outside.

[00:54:30]Now we are no longer what? We are no longer ignoring what the internal what resistance. We are no longer ignoring it.

[00:54:39]So guys, it is the voltage that is being supplied.

[00:54:55]This is the voltage that is being supplied.

[00:55:00]Voltage that is being supplied by what?

[00:55:03]By the bait.

[00:55:06]When there's no flow of when the current is not moving inside the second the second if the current is not moving the current is stationary the battery is going to give us what 12 vol and remember if it means for example so it means this 12 volts It's the voltage that the battery is giving to the circuit. When the circuits are not when the circuit is not what it's not working when the circuit is not working is not functioning the that battery will give us how much voltage 12 volts sharp. But remember once the current guys once current once the internal resistor will take as a as a human being you have you have energy when you wake up in the morning you have energy that you're going have to distribute it what in two ways. You are going to have to distribute that energy internally and you're going to have to distribute that energy what externally.

[00:56:37]Meaning what does that mean? It means in life when you have energy and you wake up in the morning there's energy that you're going to use for yourself for yourself. hair, your what? There's energy that you're going to use for your for to maintain your body, to think, to speak. There's energy that you're going to use for yourself.

[00:57:00]And then there's energy that you're going to use externally. Externally means what? There's energy that you're going to use for your friends. You're going to talk to your friends. Um you're going to play with your friends. You're going to write. That is external energy.

[00:57:13]Okay? So in the morning let's say in the morning you have energy of what of 100 jewels and so if you have energy of 100 jewels for you wake up in the morning there out of that 100 maybe 10 10 10% let's say 10 jewels out of 100 10 jewels you are going to use it for what for yourself to speak to sit to walk then the other night will go to what to doing what to doing things external for friends whatever whatever so on and so forth.

[00:57:50]So, so this 12 guys, this 12 if the current is not working, the battery will give us how much? 12 V.

[00:58:02]But once the current it's a circuit this one is going to take a certain amount before it even before it even enters here before these ones get the voltage the internal resistor will take the voltage first before anything else when you go up and then you start to make money and that 70,000 or that 80,000 it clicks into your account I repeat once you grow up and then you start to make money once that 80,000 that 30,000 doesn't matter or give 500 grand or it's 50 it doesn't matter but once you get that money that you you went hard for that month.

[00:59:04]I I really pay yourself first.

[00:59:12]Pay yourself first.

[00:59:20]efforts because your happiness your happiness matters because you can't go to work by yourself first. Take care of yourselves then others will what will fall into place. Okay. So that's what the battery does. The battery teaches us what the same thing 12 this are not going to get this 12. You this is you you this is you internally pay yourself first. So there's going to be what you call volage drop.

[01:00:23]Voltage drop. Voltage drop lost voltage loage.

[01:00:33]Voltage lost. It means the battery it's paying itself first. So I'm just thinking example if it's going to pay itself first by what let's say it pays itself internal resistor the internal resistor takes what one volt so these all of these these ones 1 2 3 all of them now have to share what is left they have to share what is left guys if the internal resist guys if The internal resistor takes all the 12 volts. These ones are getting nothing because everything voltage internal resistor takes first internally. Okay.

[01:01:20]So if it's 12 and a 2 volt this internal resistor is taking 2 volts it's using 2 volts. Then 1 2 3 will have to receive how much? 10 volts. But whenever you add the voltage that is taken by the internal resistor and then you take the voltage that has been taken by these three then when you add them they are supposed to give us what the EMF goping a formula called what they developing a formula called emf is equals to what the v internal what is internal the voltage that that's being taken by what? by the internal resistance plus the voltage of ext external and then the voltage that is what that is being used by what by the external what resistance guys that is outside the parallel connection Any am that is outside the parallel connection will receive total current.

[01:02:43]Guys, I repeat again the internal sorry any which is this one. This one is inside the parallel connection. This one is outside the par. Any resistor resistor any resistor that is outside the parallel connection will receive total current or not receive will measure total current and then any any am connection will not measure what the total current it will measure what a current that is lower than the total current. Why? Because in a parallel connection current is shared which is what we experience what a current drop.

[01:03:26]There will be a current drop in each section. But when you add both of those currents, they have to give you what the total current. That's number one. Number two, any resistor?

[01:03:40]Any resistor that is outside the parallel connection, any resistor that is outside the parallel connection has to receive total current.

[01:03:55]All of them they have to ac this this resistor internal resistor is it inside the par connection or outside the par? It's outside the parallel what connection. Therefore it will receive it will receive total current. This one it's outside the parallel connection. It will not receive the total current. This one and this one are inside what? Those ones are inside what? The par connection. Therefore, they will not receive what the total current sh Come on. These ones the resistor with high resistance will receive low current.

[01:04:56]I'm sorry for that. Um, I repeat the the resistor Okay.

[01:05:27]Um, sorry, sorry for that one guys.

[01:05:29]Sorry for the internet. Um, now I repeat any guys between the resistor this for example which one is greater between 14 and 12 obvious guys is what it's 14. Therefore, 14 will receive what? 14 will receive higher current. Ah, this one will receive low current. This one will receive what?

[01:05:54]High current. In a parallel connection, the resistor with what? With high what?

[01:06:05]So guys, the resistor with what? The resistor with high the resistor with high resistance will receive low current. The resistor with low resistance will receive what? High current. While both of them are receiving what? Equal amount of what? Of voltage. Or they're using equal amount of what? Of voltage or what? Or in sharp.

[01:06:39]Uh okay can I read the questions now fast first fast first fast first fast first fast first fast first fast first fast first fast first fast first fast now the first one write down the voltmeter reading at V1 guys write down the voltmeter reading at V1 here the which is going to be number one V1 is going to be what is going to be zero it's going to be 0 volt guys why it is 0 volt because a resistor does not work What? Over what? The what is this? Over the the switch. Guys, I repeat the voltmeter.

[01:07:34]No energy will be what will be lost or no energy will be passing through that process. Okay. Then 8.2.

[01:07:47]Okay. Now switch is now switch is what? Okay. So so guys can I do this?

[01:07:57]Fast.

[01:08:06]Is the current moving or is the current not moving? Fast. Fast. In the second.

[01:08:12]Is the current moving or is the current not moving?

[01:08:16]Moving or not moving?

[01:08:19]Moving or not moving?

[01:08:57]Yeah guys, is the current moving or not moving?

[01:09:20]Okay, correct. Correct. The current is not moving.

[01:09:27]The current is not what? The current is not moving. Guys, if the switch is open, if the switch is open and that open switch is outside the parallel connection, the circuit is not working.

[01:09:41]But if the switch is open but it's inside the parallel connection, the circuit is what? The circuit is the circuit is what is working sharp. Then eight pointing the switch is now closed.

[01:09:58]The switch is now closed. Here is now the switch. The switch is now closed.

[01:10:03]Now current is allowed to pass. Bar the switch now is closed. And the voltmeter reading at V2. Where's V2, guys? Where's V2? I didn't see V2.

[01:10:20]Oh, so yes, the reading is what? It's now six volts.

[01:10:28]I repeat guys they said to us the reading is what it guys you are going to start here guys when you write physics we going to start here why because we have the voltage of here and also we have what we have the resistance we can find what the current we can find the current that's why they say to us calculate reading at A1. Guys, can I ask you guys can I ask you at E1 fast? Is the is the current at E1 here?

[01:11:07]Is the current at E1 here? At E1 here, is it is it is A1 going to measure total current or is it not going to measure total current? Guys, can I ask you is the voltage at A1 here is it going to be total current that is being measured or not total current? See total current not to current.

[01:11:37]Is it going to be total current or it's not going to currently correct to what? total. Therefore, number two, number two.

[01:12:06]Can I ask what what current is going to pass here?

[01:12:12]What on 8 ohm resistor the the 8 ohm resistor? This 8 ohm resistor is it going to the current that's going to pass at 8 ohm resistor is it total current or not total current is the current resistor is it going to be the total current or not the current The answer is what is total what?

[01:12:54]Correct guys. Correct.

[01:12:57]So it's going to be what?

[01:13:02]So that means because is for V.

[01:13:32]Resistance is Sorry for that one guys. People are calling So guys, sorry guys for that one. I'm really sorry on that one.

[01:14:22]Resistance volage current. I get this is over 1 m* 8 I = what * 6 our current is what our current is going to be 3 4 which is 3 4 which is going to be 0 75 amp if I'm correct. So guys I repeat it says 0 75.

[01:15:01]So what does it mean? It means this one is also going to measure 0 7 5 and this one is going to receive what? This one.

[01:15:09]This one is going to receive 0 75.

[01:15:15]So 75 and resistance.

[01:15:31]Remember any resistor that is outside the parallel connection will receive total current sharp. Then the following question then the following question.

[01:15:44]Yeah, it says calculate the effective the following question. It says calculate the effective um calculate the effective what effective um excuse me the effective effective resistance of of the parallel connection guys. effective D2.

[01:16:21]A lot of people are going to say what? A lot of people are going to say that.

[01:16:30]Can I just do this?

[01:16:36]E1. So effective resistance for that one guys.

[01:16:58]Okay.

[01:17:06]move chief.

[01:17:12]Okay.

[01:17:20]Okay guys, they said calculate the effective effective into what resistance of the par connection. Effective resistance A1. Our answer is going to be what? It's going to be 1 / r= 1 / r1 + 1 r2. That is the formula for what? For the parallel what? Connection.

[01:17:44]It's going to be 1 / r= 1 / 14 + 1 12. Okay. Then 1 / r paral is going to be what? It's going to be this one time this one 12. Then this one * this one is going to be + what? 14. Then this one * this one 12 * what 14. I get then we do what the reciprocal inverse 12 * 14 12 + 14. Guys, our final answer.

[01:18:30]Our final answer.

[01:18:35]Our final answer.

[01:18:41]Our final answer. Can you please help me with the final answer?

[01:18:46]Guys, can you please help me with the final answer?

[01:19:08]Can you please help me with the final answer?

[01:19:12]12 * 14 all divided by what? By 16 y sorry y 4 in the denominator.

[01:19:31]There's no four.

[01:19:35]Do you? It's 40. Not four.

[01:19:38]There's no four. It's 40. Sorry.

[01:19:42]It's four. It's 40.

[01:19:48]Guys, please help me with the answer.

[01:19:53]Please help me with the answer. 12 * 14 / 12 + 4.

[01:19:59]How much?

[01:20:11]10 comma 5 10 5 what oops so these two are now 10 comma 5 again these two I repeat They are worth what they then the following one let's look the following one the following question but the internal what resistance the internal resistance guys this is the formula for what for the internal resistance the formula for the internal resistance it's E= I R L + small R.

[01:21:07]I repeat again the formula for internal resistance is what? It's E= to I open bracket R plus small R. What is this E infinity?

[01:21:22]What is this E? This E is what? It's our EMF family. Can I ask do we have the EMF?

[01:21:29]Yes or no?

[01:21:32]Can I ask just yes or no? Do we have the EMF? Do we have the EM? Do we have EMF?

[01:21:43]Yes or no?

[01:21:49]Yes. Thank you. Sh is correct. Now I want to ask you now the second question. The second question shar um the second question says sh can I ask you the second question? Do we have the two this guys I repeat this eye this eye keep promising Guys, I repeat for the last time.

[01:22:34]Do we have the current, guys? Do we have the to current, guys? Do we have the TA current? Do we have the TA current?

[01:22:48]Yes or no? Do we have the TA current?

[01:23:06]Yes, correct. We do have the total current.

[01:23:12]The last one, do we have the total X?

[01:23:15]Guys, this one, this the big R. The big R, guys. I repeat the big R is external resistance.

[01:23:24]Small R internal big R external.

[01:23:30]Can I ask for the last one? The last one for now cuz they want us. They want this one. They want this one. They want the resistance. Guys, do we have the external resistance? Do we have the external resistance?

[01:23:43]Guys, do we have the external resistance? Yes or no? Do we have the external resistance?

[01:24:07]Yes. Yes.

[01:24:16]Zumo says yes. Says yes. Says yes.

[01:24:21]Says yes.

[01:24:23]Says yes.

[01:24:26]And then says yes. And then my answer it is says you guys are lying.

[01:24:34]We don't have the external resistance.

[01:24:39]Why? Why don't you have the external resistance? Because this 10 5 this 10 5 it's the ex is the parallel connection resistance.

[01:24:52]What is external resistance? External resistance. It's when we make all of these resistors that are outside the battery. All the resistors that are outside the battery, we are we have to make them one. And we don't have anywhere we made them one resistor. But we already know we know we now know guys. We now know that 10.

[01:25:18]We no longer guys we no longer have 14.

[01:25:20]We no longer have 12. We now have what?

[01:25:23]10 5. Now we need to add this one and this one because these two are now what?

[01:25:29]In with each other. Now the external the external resistance this one which is 10 5. Our answer is going to be 18 5 ohms. Now this is the external resistance here. The external resistance is that we took this two. We made them one. After making them one, we said this one that we added with the other remaining what resistance inside what the external to the external circuit and we made them what? One, which our answer is going to be what? 18, 5.

[01:26:11]Now our our we now have emf, we now have intern total current and we now have what the external resistance. Then our final answer is going to be what familiar? Our final answer is going to be how much? EMF 12 current 0 75 resistance 18 5 plus a small R.

[01:26:38]Then we divide by what? We divide by 0 75. Then we divide by 0 75.

[01:26:48]Then 12 / 75. Keep 24 that I 18. Guys, can you please check for me?

[01:27:15]This is supposed to be 18.

[01:27:20]Five 16.

[01:27:30]So my answer is going to be what? 16.

[01:27:35]Okay. But the answer is what? It's 16.

[01:27:39]Then this one cancels this one. Our answer is going to be what? 18 5 + Guys. No, something is wrong.

[01:27:56]Guys, where did we mess up?

[01:28:02]Guys, can you please check for me here?

[01:28:03]Can you please check if I made a mistake? Can you please check if this is over?

[01:28:13]Can you please check if this is the question?

[01:28:26]It's 6 12* 14ide by what?

[01:28:57]26 is it was okay.

[01:29:08]It was my mistake. I did not write 14. I had written four. That's why some of you guys divided by how much? By 16. My apology on that one. So the answer is actually what? It's actually 6 4 6 what?

[01:29:23]Okay. Now when I'm going to change this one is now going to be what? Now going to be 6a 4 6 then 8 + um 6a 46 answer is going to be how much?

[01:29:36]146.

[01:29:39]So now this is the total external what resistance. Now we take this one we substitute it here. It's now going to be what? is now going to be 14 4 6 which here is now going to be what is going to be 14 6 then we take this one to this side it becomes what 16 - 14 = to R and our R is going to be how much 1 5 4 ohms of resistance Yeah. Yeah. Yeah.

[01:30:43]Okay.

[01:30:49]Then they say we should calculate how much is in A2. Guys, what do we need to determine A2 family? Guys, asking what do we need to determine what A2?

[01:31:03]What do we need?

[01:31:10]Okay. Here an an easier method you do this. You say resistance of this one. You say the resistance the resistance of this one is going to be much guys. The resistance of this one we have 14 and then we have what? We have 12.

[01:31:28]You're going to write them down. You're going to write 14 and you're going to write 12.

[01:31:36]You're going to say 14 and then you're going to you're going to 12. 14 12. Then you're going to add both of them. You're going to add both of them, guys. And you're going to divide by that amount.

[01:31:46]You're going to say 14 + 12. The answer is 26.

[01:31:52]The answer is 26. So you're going to divide both side by 26. Then you're going to divide both sides by 26. I repeat again. I said 14 14 12 12 12 14 14 + 12 G 2 26 26 Right.

[01:32:13]The total current current at 8 ohm resistor.

[01:32:20]Yeah. Yes. 8 ohm resistor is what total current guys after doing this I repeat after doing this. After doing this, you said 14 14 12. Then you said 14 + 12 26 26. Then you're going to multiply.

[01:32:38]You are going to multiply by what? By the total current. Guys, I repeat, you're going to multiply by what? By the total current.

[01:32:47]You're going to 75.

[01:32:51]And then you're going to 75. Guys, our answer. Can I ask what is the answer this side guys? What is the answer this side? 14 14 / 26 75 0 4. Okay.

[01:33:18]This this side is going to be 0 4 and then this side is going to be 0 3 5 and sharp. So why guys if guys if you do this it's going to give you Zma 4 and Zma 35 when you add both of them guys when you add both of them when you add both of them they supposed to give you what ZA 75 then guys when I started everything here I said I said I said here I said the the resistor with the highest resistance will receive low current.

[01:33:59]I repeat the resistor in a par in a par connection. A resistor with high resistance will receive low current. The resistor with low resistance will receive high current.

[01:34:18]Okay. So between this one and this one, which one is higher? This one is higher.

[01:34:23]The one that is higher belongs to the smaller one which is this one belongs to the 12 ohm resistor and then this one belongs to the 14 ohm resistor.

[01:34:34]Therefore a2 therefore a2 is in the 12 ohm resistor. Therefore a2 is equal to 0 4 amps.

[01:34:57]Colgate.

[01:35:12]Any question?

[01:35:15]Any question?

[01:35:16]Any question?

[01:35:23]Any question?

[01:35:41]Any question? Okay, the last one.

[01:35:47]The cost of electricity, guys. The cost of electricity.

[01:35:55]The cost of electricity, guys. The cost of electricity is always equal to powerip time and then multiply by the rate.

[01:36:13]Guys, the cost of electricity, I repeat, the cost of electricity, the cost of the electricity, I repeat again, the cost of the electricity is equal to powerip by the rate. They number one, they give us they said calculate the cost of the of the electricity. If the power that is used the power that is being used is what? It's 3,500 W. That's the first one. This is power.

[01:36:48]Thank you. Number two, they said the rate they said the rate is what?

[01:36:57]200 65 cent per kilowatt an hour. That's the first the second one. They want the cost the rate is 3,500.

[01:37:13]No power is 3,500 W. The rate 265 and then time time is going to be how much? The time is going to be 50 minutes.

[01:37:27]So they said calculate what the cost.

[01:37:29]It's very easy.

[01:37:32]Can I ask So here is what this is. The units have to be the same. This is this is kilow. I repeat kilow. Therefore we have to take this to what? 2 kilow. How do we take to kilow? We divide by what? 5,000.

[01:37:55]So our power our power is going to be 3,500 /,000.

[01:38:02]That's the first power.

[01:38:04]Why? This is power this one. But the problem is we want our power in what? In kilow. So in order for you to determine this one, you don't use power of watt.

[01:38:14]You use the power of what? Of kilow. So your power you divided by what? T00. Now let's go to what? To time.

[01:38:23]Time. This is what the the last one here is what? Hours. Hour. Minutes. Hour.

[01:38:31]Minutes. Hour. Minutes. We have to take this minutes to what? 2 hours. How do we take out into minutes to hours? You simply divide by 60.

[01:38:46]You simply divide by 60.

[01:38:49]Minutes to hours. You divide by what? By 60. Worth to kilowide by what?

[01:38:57]Then you multiply by what? By the rate.

[01:38:59]The rate is how much is 2.

[01:39:03]Can you give me my answer here? Give me my answer.

[01:39:08]Give me my answer.

[01:39:16]What is the answer?

[01:39:24]Seven.

[01:39:27]Guys, can I please confirm 73? Is it 72?

[01:39:36]The cost.

[01:39:38]Okay guys, the cost of electricity of an instrument in 50 minutes 23 then we'll be done with today's work.

[01:40:03]Any question?

[01:40:07]Any question?

[01:40:22]Any question family? Any question.

[01:40:37]Okay, family. If there's no question, I would like to say thank you um for your attendance. I know it's quite challenging. Some of us have data, some of us don't have data. But I just hope I just gave you Another clarity on electric circuits because if you check very carefully electrostatics out of 150 out of 150 electrothetics it's around 20 and then what is this electric circuit it's around what 24 so it's 44 out of what? 150 which is around what 30 plus%.

[01:41:16]So 30% 40 guys.

[01:41:28]Thank you. So thank you very much.

[01:41:34]Then thank you very much guys. Then let's pray so that we can close today's class because I see no question.

[01:41:41]And then like I said tomorrow's class immediately Guys, immediately please move as fast as you can to what to move as fast as you can toward.

[01:42:00]Thank you very much. Can you guys please your strength and leadership? We know father we experiencing a lot of challenges, a lot of encounters but we know father whatever we do we shall always get the glory and the praise father not ourselves as human beings father. so that people may see your power that it does not lie within us as individuals but you're a good and living God regardless but in the might name of our Christ we pray. Amen. Then thank you very much guys. See you guys later. Shut up.