Presentation on theme: "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."— Presentation transcript:
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 Electrons Light 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 generator or
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,
16 Electrons Light bulb Magnet
17 Electrons 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 switch lamp 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 battery 2. 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.