P5 Electricity

Question 1

What colour is the live wire and what does it do

Answer 1

Brown- carries current to the appliance at a high voltage

Question 2

What colour is the neutral wire and what is its role

Answer 2

Blue- completes the circuit and carries current away from the appliance

Question 3

What colour is the earth wire and what is its role

Answer 3

Green and yellow- a safety feature, stops the appliance becoming live because it connects metal case to the earth

Question 4

Describe the structure of a 3 core cable

Answer 4

Appliance has a metal case
The earth wire is connected to the longest pin
If the live wire touches the case it is earthed and the case doesn’t become live itself

Question 5

Describe the structure of a 2 core cable

Answer 5

Appliance has a plastic case
There is no earth wire as the case is an insulator
If live wire touches the case then the case does not become live

Question 6

What are the plugs in a three pin plug

Answer 6

Live pin, neutral pin, earth pin

Question 7

What is the role of the fuse

Answer 7

Safety measure- If the current is too hight it will melt the circuit snd stop the current from flowing through

Question 8

What happens to the current when the resistance across a component becomes greater

Answer 8

The current that flows becomes smaller