L4: Plugs and Wires

Question 1

What colour is the live wire?

Answer 1

The live wire is brown

Question 2

What colour is the neutral wire?

Answer 2

The neutral wire is blue

Question 3

What colour is the earth wire?

Answer 3

The earth wire is striped with yellow and green stripes

Question 4

What is the path of the current in a normally functioning circuit?

Answer 4

Supply -> Live wire -> Appliance -> Neutral wire -> Supply

Question 5

What is the function of the live wire?

Answer 5

The live wire carries current from the supply to the appliance

Question 6

What is the function of the neutral wire?

Answer 6

The neutral wire completes the circuit in a mains power supply carrying current from the appliance to the supply

Question 7

What is the function of the earth wire?

Answer 7

The earth wire is connected to the metal casing of a supply. If the current somehow travels into the outer casing of the supply, it will travel into the earth wire which has low resistance instead of through you. It takes the current to the ground

Question 8

What is the function of the fuse?

Answer 8

The current flows through the fuse before flowing through the appliance. It has a very low resistance meaning that a very high current can flow through it. When current is too high, it will melt the fuse since it has a small diameter and low melting point. This breaks the flow of current in the appliance

Question 9

What are the standard fuses?

Answer 9

3A, 5A and 13A