Electricity In The Hone

Question 1

Describe the neutral wire.

Answer 1

> blue

> on the left of the plug

Question 2

What colour is the earth wire?

Answer 2

> green and yellow

Question 3

Why do some appliances have a 2 cord cable?

Answer 3

> because they are double insulated ( their outer casing is plastic)

> and so do not need the earth wire

Question 4

What happens if the live wire touches the metal casing?

Answer 4

> the earth wire directs the current away from the casing towards the ground

> earth wire has low resistance, high current which blows the fuse, breaking the circuit

Question 5

What does RCCB stand for?

Answer 5

Residual current circuit breaker

Question 6

How does an RCCB work?

Answer 6

It detects a change in current between the live and neutral wires, immediately tripping the circuit and stopping the current from flowing.

Question 7

What are the advantages of an RCCB over a fuse?

Answer 7

> it breaks the circuit immediately

> it can be easily re-set at the flick of a switch

Question 8

Describe the live wire.

Answer 8

> brown

> on the right of the plug

Question 9

Define PD?

Answer 9

> amount of energy transferred per Coulomb of charge.