1

Electricity Generation

with

Magnets or Lemons

2

If you want to do something useful - you need energy

We feel tired when we run out of energy

So we eat to give us energy.

3

When we eat

we can walk, think, run, lift, turn, push, pull, and ------

We need energy to work and play.

Our energy comes from food.

4

Energy makes things work

5

What do we need to make these work?

Electricity!

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Without electricity - -

We might use Candles Coal fires Semaphore to

send messages Piano - - -

Without electricity our lives would be very different.

7

What is electricity?

It is the movement of very, very tiny particles called electrons.

As the tiny, tiny particles move they carry energy

Electricity flows through wires

-

8

Supply of electricity Switch

ElectronsLight bulb

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How big are electrons? How many electrons in a piece of

copper wire 1mm thick and 10cm long?100,000,000,000,000,000,000

One hundred million million million or one hundred billion billion

Electrons are very, very small

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Electricity transports energy from one place to another

For this we need:

• A complete circuit made of conductors with lots of electrons

• Something to provide energy to push the electrons round the circuit

• To where we want to use it.

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Why is electricity important?

It can make things work.

It is easy to move the energy around using wires

to just where you want it!

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How is electricity made?

We need something to provide energy to push the electrons around the circuit.

2 main choices:

A battery A generatoror

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Lemon battery

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A battery- uses chemistry to release

energy

Portable Cheap

only store a fixed amount of energy big, heavy batteries are needed to store lots of energy

In a car a large battery is used to start the engine and light the lamps.

15

Generators

Use energy to make electricity

A moving magnet is able to push the electrons along a wire.

The energy to move the magnet is carried by the electricity,

16Electrons

Light bulb

Magnet

17Electrons

Light bulb

Magnet

Magnet has to move to make electricity

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We can generate electricity

- by moving a powerful magnet through a coil of wire.

coil

magnet

switchlamp

bulb

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What have we learned?

Energy makes things work. Electricity can carry energy

to where we need it. Electricity can be made using

1. a battery2. a generator.

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Huge generators as big as houses are needed to generate electricity for homes, factories and schools.

We can generate electricity -

but only small amounts - even when we work hard.