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This is a Clilstore unit. You can link all words to dictionaries.

Electricity

  1. Oh no!there is no electricity I was just about to finish my game. I have to restart it now.
  2. It seems like there is still a problem in the electricity supplies Don't worry it'll be back in a moment.
  1. Wow it's back.We can't on do anything without electricity these days.
  2. Yeah, but do you know from where your electricity comes from?
  1. I think it comes from that switch !Right?
  2. You are very right!Electricity comes to this TV from this switch. But what about the source of all the electricity that comes to everyone's home?
  1. Let me ask my friends. Do you know where electricity comes from?
  2. Do you want to k now the sources of it and how it is produced? Ok,ok.Take a look here.
  1. What is this?
  2. This is a coil of wire and a magnet mounted on a shaft.
  1. What it is used for?
  2. It is used to produce electricity.
  1. But how?
  2. If we spin a magnet around with-in a coil of wire electricity is produced in the wire.
  1. Oh, it is so simple!All we need to have is a coil of wire and a magnet to make electricity.
  2. And just spin the magnet with-in the coil.This process is known as electromagnetic induction.
  1. Can I spin this magnet?
  2. Oh yes!But let me first attach a small electric bulb with the wires.Now you can spin the magnet with the help of the handle.
  1. Wow ,the bulb is on!
  2. So guys now you know the basics of producing electricity !Now something to remember ! The machine having a magnet and coil of wire ,in this way, is known as generator .
  1. So we need a generator like this to produce electricity?
  2. Yes, in most of the cases a generator is required.
  1. Wow ! Now I can produce electricity for my entire home with this generator .
  2. But see,this is too small !This can light up only a small bulb.You need a big generator for getting more electricity.Let me show you !
  1. Oh ,it does not look like the earlier generator!
  2. Let's peep inside!Oh yes, it also has a big magnet linked with a shaft and wires all around it.Remember every generator has this kind of arrangement inside it.
  1. Hmmm, if I spin this generator shaft I can light up my entire home !
  2. Hmmm, now try to move it.
  1. Ah!Ah!I can't spin it. It is very heavy to move.
  2. Now have a look at these giant generators!
  1. Oh,wow! That's so huge.Yeah,these big generators are used to produce electricity for a whole city.But how do they spin the magnet inside these big generators? I can't even move the smaller one!
  2. To move the magnet inside the big generator a big fan is attached to this shaft.
  1. A big fan?
  2. Yeah, look here. These big bands are called turbines.
  1. Turbines?
  2. Yeah,turbines. Friends! hope you remember generator ,the machine to make electricity !now I remember turbine that is the second most important tool A turbine helps the generator to work so that it can produce electricity.
  1. But how does this fan,I mean turbine help in turning the generator?
  2. Look here! In some cases ,a lot of water is poured over this. The flowing water makes it turn.When the turbine moves, shaft of the generator also moves.
  1. Wow ! so water helps in running the generator!
  2. You got it right! The electricity is generated with the help of the water .This kind of electricity is known as hydroelectricity The word hydro means related to water.
  1. But to turn a big generator ,we may need a lot of water? From where all this water will come ?
  2. For that ,we need to visit a dam.
  1. Dam?What is a dam?
  2. Let's go and see !
  1. Wow! There is a lot of water here!Seems like water is being stopped here!
  2. Yes, it is a kind of a barrier to  stop river water. Lot of water is collected here.
  1. But why?
  2. Well Jimmy ,this stored water is used either for water supplies or for generating electricity.
  1. Oh ! That is why there are a lot of turbines and generators nearby!
  2. This is called hydro-electric plant. Water from higher level flows into a pipe that carries it down to a turbine.As water moves down ,it gains a lot of pressure. This flowing water drives the turbine that is connected to the generator.And inside the generator , there is a large electromagnet in the coil of copper wire. When this magnet rotates inside the coil of wire. electricity is produced.Then it is sent to our homes through transmission lines.
  1. Wow! It is so clear to me. Water from the dam moves the turbine,turbine drives the generator. And generator produces the electricity.
  2. Guys, have a closer look.This is how water helps in producing electricity.
  1. Me visit do the damn let interesting but tell me:  is there any other way to turn the turbine?
  2. Yes. There are many ways. In many cases it is moved by steam.15
  1.  Steam, but how can steam move any plane?
  2. Look at this. Can you spin it?
  1. It is very simple.I have to blow some air to it. See?
  2.  It is  the same with turbine. We need some air to blow it.
  1. But you said steam.
  2. Yes. Steam is a gaseous form of water.
  1. Steam is a gas. It is just like air. Let me try to make this stop by spin. 0h, it did not even move.
  2. It is very heavy. We need a lot of preasure. We need a lot of air to move it.
  1. But from where we get that much of air?
  2. In most of electricity generating plants water is put in big tanks. Then it is boiled to produce steam and the turbine is moved by the preasure of this steam  Now let's see how the whole system works. Water is heated to produce steam and this steam moves the turbine conected to a magnet inside the wire of coil. But can you name the fuel used for heating the water to produce steam?
  1. We can use electricity to heat water like we use it at home.
  2. You are right. But using electricity to produce electricity can be very costly Think more.
  1. We can use carbon.
  2. Yes, we can use carbon. We can use too natural gas, biomass or uranium, etc.
  1. Are those fossil fuels? so we can use carbon and natural gas as fuel to heat the water to produce steam  to turn the turbine.
  2. Yes. And as we use the heat to produce electricity, it is also called permanent energy.
  1. And this is done in thermal plants.
  2. Correct. But the plants where we use uranium as fuel to produce electricity are known as nuclear power plant.
  1. I am worried.
  2. Why?
  1. If all fosil fuels get over, then there would be no electricity in this world.
  2. Even scientist are worried. They are finding new ways to produce electricity.
  1. Like?
  2. Now some of the electricity is produce with the wind and even sun.
  1. That is great. Can you tell me more about this?
  2. Okay. This is called a windmill. The blade of windmill acts as turbine. The blade moves due to the wind.
  1. So we don't need fuel when generate the electricity. Now tell me about the ways to get electricity from the Sun.
  2. Here it is. See? Sunlight falls on special pannels with cells. This cells produce electricity
  1. Wow. We can get electricity from wind and Sun and they will allways be there.
  2. So guys, some homework for you.
  1. It is very easy.
  2. Watch some videos on dance and electromagnetic induction.
  1. Also click on this link to be made up a raise on MeetMe d news dot com.
Clilstore Wind energySolar energyHidraulic energyNuclear energyInvestigationExerciseQuiz

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