● Teaching aims:

1.Let students know electricity comes from a battery or a factory(power plant).

2.Let students learn to make a simple battery.

● Introduction :

There are some lamps in our classroom that give light. Why can they give light? Without electricity,what happens?

Electricity is very important in our life. Do you know where the electricity comes from?

● New lesson

1. Learn about battery produce electricity.

(1) What is the shape of a battery?

(2) What needs batteries to work? (mobile phone, flashlight, toy)

(3) How does the electricity come from a battery?

I will give you a bulb, a wire and a battery. Who can make the bulb light up?

(let a student come to the front and try.)

(4) (Show a loudspeaker.) Who can make the loudspeaker give a sound with a battery? (let some students come to the front and try.)

(5) Sum up: There are two poles on a battery. One is the positive pole and the other is the negtive pole. When you connect the positive and negitive pole with a wire the electricity will go out and flow through the wire to the object needing the electricity.

So the bulb will give light and the loudspeaker will give sound.

2. Learn to make a simple battery.

We can make a simple battery by ourself. How can we make it?

Step1: Fill a beaker with vinegar.

Step2: Connect a wire to a sheet of copper and another wire to a sheet of zink.

Step3: Put the copper and zink sheets into the vinegar.

Step4: Connect the loose ends of the two wires to the loudspeaker.

When you have heard a sound from the loudspeaker you have succeeded in this experiment.

3. Let students know how the power plant produces electricity.

There are lamps ,TVs,frigs and air-conditioners in your home.They need electricity.Where does the electricity come from?

Show a model of an electric generator,and how it works.

Steam,moving water,wind and atomic energy can make electric generators work In an power plant.
In an power plant,the electricity is produced and is sent to factories ,families ,schools and so on.
Many places need electricity. So we must not waste electricity.