Albert Teen
Electricity

YOU ARE LEARNING:

Wires, Fuses and Plugs

# Wires, Fuses and Plugs

### Wires, Fuses and Plugs

This lesson looks at the components in a plug; the live wire, the neutral wire, the Earth wire, and the fuse.

1

The image shows the inside of a plug.

Notice there are 3 wires and a fuse.

2

Do you know what the name of the wire labelled X is? Sometimes known as the ground wire, it is a safety wire which directs current away from components in order to prevent dangerous electric shocks or fires.

3

Which of the 3 wires actually carries the current?

A) Earth B) Live C) Neutral

4

Which of the 3 wires is a safety wire to ensure the appliance does not conduct electricity?

A) Earth B) Live C) Neutral

5

Which of the 3 wires is there to complete the circuit?

A) Earth B) Live C) Neutral

6

So there are 3 wires in the plug.

The earth wire (green and yellow) is the safety wire to prevent the appliance conducting electricity.

The live wire (brown) carries the electrical current.

The neutral wire (blue) completes the circuit.

If the earth wire was faulty, what would happen if the live wire was loose, and somebody touched the case of a plug?

Which two wires in a plug form a complete circuit with a household appliance? Select the correct two from the list below.

If mains electricity has a voltage of 230 V, what is the potential difference across the live and neutral wire going to be?

1

Have a good look at this table.

It shows the potential differences across the wires in a plug.

2

Why is there 0 V between the earth and neutral wire?

A) They both carry the current. B) Neither of them carry the current.