七年级英语Electricity课件.ppt.ppt

文档介绍：Chapter 5 Electricity Task 1 What do we know about energy ? What is it ? It’s the power that makes things work . Lead in What happens if a machine doesn ’t have energy ? It doesn ’t work . Task 2 Invisible 看不见的 flow through a wire, like water What do we know about electricity ? Can we change electricity into energy ? What kinds ? ? Task 3 Heat energy Movement energy Light energy Sound energy Look at the following things . What kind of energy do they produce ? Discussion: Light energy Light energy Sound energy Movement energy Heat energy Light energy Movement energy Heat energy Movement energy air – conditioner washing machine vacuum cleaner rice cooker television iron fridge fan micro-wave oven recorder radio torch kettle How many home appliances can you tell us in our life ? What kinds of energy do they produce ? Where does electricity come from ? Task 3 1. Through thin wires . 2. Be connected to cables buried under the ground. 3. A power station.