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.

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!

6

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

9

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

10

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.

11

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!

12

How is electricity made?

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

2 main choices:

A battery A generatoror

13

Lemon battery

14

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

18

We can generate electricity

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

coil

magnet

switchlamp

bulb

19

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.

20

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.