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Electrical circuits. Series and parallel

0:06 Hello!
0:08 What is going on young scientist?
0:11 Hi! I'm trying to make an electric circuit
0:15 Electric circuit? WOW...
0:18 Have you learnt that in school?
0:21 Yeah....a little bit
0:24 I have learnt that, the simplest completed circuit is a piece of wire from one end of a battery to the other.
0:31 Mmm... yes! An electric current can flow in the wire from one end of the battery to the other.
0:38 But, nothing useful happens, the wire just gets hot and the battery goes flat.
0:45 You are right. To do something useful with electric current, we need to put an electrical component into the circuit such as a bulb that can use the current to make something happen.
0:59 Very good, you are very know quite a lot.
1.02 Now, let's learn some more
1:06 When electric charges move in a wire, we see that an electric current flows in the wire. It's like a wild current of water flows in a river.
1:17 Yeah... it is like a constant flow of electrons through something.
1:21 When a wire is connected to each end of the battery, electrons begin to flow from negative to positive.
1:28 Yes, from minus to plus
1:31 And this flow os electrons is called current.
1:36 Now, look at this.
1:38 Hey! There is no battery in this.
1:40 Yeah... If there is no battery, no electricity will flow.
1:45 So the first condition, for the flow of electricity in a circuit is that, there should be something to make the electrons flow.
1:54 Now, look at this second circuit.
1:57 What is misssing?
1:59 Oh! The circuit is not complete.
2:04 Correct. This is an incomplete circuit.
2:07 You need a complete bulb of the current to flow in. This is called an electric circuit.
2:14 So you need some power source like a cell or a battery and you need circuit for electric charge to flow.
2:23 Yeah, here it is.
2:31 Look at this main circuit.
2:34 It has a battery, and two bulbs and it is complete with wires.
2:39 Yeah... It is very good. This kind of circuits are known as simple or series circuits.
2:45 Oh! So... if this is a simple circuit, is this something called complex circuit?
2:52 Ah! There are two kind of circuits: series and parallel
2:57 So mime is a series circuit. Can you tell me about parallel circuit?
3:02 Hold on my scientist brother. Let's first learn how to draw a circuit on a paper.
3:09 Oh! It's so simple. You need to make a picture of a battery and a bulb.
3:17 Yes. It is very simple. Pattern signs are symbols for everything, like for bulbs, you draw a symbol like this.
3:25 Oh! Then you need to draw two, as my circuit has two bulbs.
3:34 An then,the symbol for a cell is like this.
3:37 Oh! Just two lines!
3:40 Now, we need to draw lines. To make a circuit we draw straight lines which take down and right angles.
3:47 Now my circuit is compelte. It looks so beautiful!
3:53 Like I told you, this is known a series circuit. Can you remove the wire from one side of the first bulb?
4:04 Oh no! But the bubs has gone off. What happened?
4:09 Everything was in series. When one part of the series was removed, the circuit becomes incomplete and then, the current stops flowing.
4:18 That is why bulbs spots working.
4:21 This is the problem with series circuits. Suppose that one bulb gets fused, all bulbs will go up.
4:29 Is then no useful this kind of circuit?
4:32 We use this type of circuit in Chritsmas of the bulb lights. One small bulb after another.
4:39 But a vary of the bulb goes off, all lights will go off.
4:44 And yes, there is another disadvantage also. If you will keep increasing the number of bulbs in the circuit, the light of each of the light will get dimmer than before.
4:54 Are there any benefit from this kind of circuit?
4:57 There are two benefits. One: it uses less amount of wires and the second advantaje is that if you want a warning that one of the components in the circuit has failed than a series circuit is used.
5:12 Now, I understand all about this simple circuit.Can you make a parallel circuit?
5:17 Oh yes. Let's make a parallel circuit for you.
5:25 Like I told you before, it requires more wires than a simple circuit.
5:30 WOW! MOre bulbs than one. Can you remove one wire from the fuse?
5:38 Look only one bulb has gone off. The second bulb is still on.
5:44 Ok, now you have understood parallel circuits. Can you draw it on the chart?
5:49 Oh yes.
5:54 Here it is! Is it ok?
5:57 Perfect! Let's clap for your work.
6:01 Now, cann you tell me one benefit on parallel circuit?
6:05 Parallel circuits are useful if you want everything to work, even if one component has failed.

6:12 This is why our homes are wireled with parallel circuits.
6:17 So even if one thing goes off, at least other things are continuing to work?

6:22 You are a genious scientist!
6:24 I can tell thedifferences between series and parallel circuits in a very simple way. Can you please pass me the remote?
6:37 Look, there are two typess of highway. One is a single lane highway and anotheris a parallel lane highway. The single line highway is like a series circuit, one car stops and the whole traffic stops.
6:52 Very good example! And multiline highway is like a parallel circuit. Even if a car breaks down, the rest of the cars can keep moving.
7:02 Very very good way of convey the circuits
7:05 See,I am a genious.You can also become a genious. You should watch everyday.

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