11. Electrical conductors and insulators

Question 1

Explain the difference between an electrical conductor and an insulator.

Answer 1

A conductor allows electricity to flow through it and and a conductor prevents electricity from flowing.

Question 2

Names some common electrical conductors.

Answer 2

Metals (e.g. copper) and water (especially with salt in it)

Question 3

Why does our body conduct electricity?

Answer 3

Because we are made mostly of water.

Question 4

Why should you not try to put out an electrical fire with water? What should you use instead?

Answer 4

Because the water will conduct the electricity. Rather use a fire extinguisher.

Question 5

Why should you not use an electrical appliance in the bathroom?

Answer 5

The water in the bathroom could conduct electricity from the appliance to your body and give you a shock.

Question 6

Name some good insulators

Answer 6

Plastic, rubber, wood, glass, ceramics

Question 7

What insulator is used on large transmission lines?

Answer 7

Ceramic or toughened glass

Question 8

How can you test whether or not a material is a conductor or insulator?

Answer 8

Set up a circuit with a light bulb and two wires. Connect the wires to each end of the material. If the bulb lights up then the material is a conductor. If not, it is an insulator.