A_dangerous_servant_课件概要1.ppt

8B Chapter 4 A dangerous servant 8B Chapter 3 1.What do you think of electricity? Why? 2.Electricity gives power for all kinds of electrical appliances. Can you name some of the electrical appliances we use in our lives? (When we plug an appliance into the wall socket, we are using electricity produced by a generator.) electrical appliances an air conditioner a blender a CD player a computer a cooker a hair dryer a lamp a kettle electrical appliances a heater a fan an iron a microwave an oven a printer electrical appliances a recorder a refrigerator a TV set a vacuum cleaner a video player a washing machine a mobile phone (a fridge) a robot Where does a robot’s energy come from? Its energy comes from electricity. Where does our energy come from? (Energy is the power that makes things work.) Perhaps without electricity our lives will not be interesting. Now let us talk about electricity. What is it? Electricity is the power which is produced by rubbing (friction), by a machine called a generator or by chemical means (e.g. a battery). Can we see it ? No, it’s a kind of energy that we cannot see. It’s invisible. Can we touch it? No, we can’t. We may get an electric shock. It’s dangerous. Power stations pylons home Do you know how electricity comes to us? The pylons carry wires. Wires carry electricity. Electricity comes into our flats through thin wires, and the thin wires are connected to thick wires. The thick wires are called cables and they are buried underground. Cables are connected to power stations. Power stations make electricity. Homework: Go over the vocabulary items and recite them. Listen to the recording of the article and read it aloud several times. Finish Ex.C/ D / E on page 46, 47. 8B Chapter 4 A dangerous servant 8B Chapter 3 Ex. Fill in the blanks with proper words: wire energy cable shock 1. Young people have more than old people. 2. Don’t touch the