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. Our energy comes from food. • When we eat • we can walk, think, run, lift, turn, push, pull, and ------ • We need energy to work and play.

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. Switch Supply of electricity Light bulb Electrons

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: or A battery A generator

13. Lemon battery

14. A battery - uses chemistry to release energy • Portable • Cheap • only store a fixed amount of energy • big, heavy batteriesare 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,

16. Magnet Light bulb Electrons

17. Magnet Magnet has to move to make electricity Light bulb Electrons

18. coil switch magnet lamp bulb We can generate electricity - by moving a powerful magnet through a coil of wire.

19. What have we learned? • Energy makes things work. • Electricity can carry energy to where we need it. • Electricity can be made using • a battery • 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.