Power cables

Name the colour of each of the three wires in a mains plug.

• Red

• Blue

• Brown

• Yellow and Green

Explain why each of the wires in a three-core mains cable is insulated.

• To keep them warm

• To keep them cool

• To prevent electrical connection between them inside the cable

What is the name given to the blue wire?

• Neutral Wire

• Earth Wire

• Live Wire

What is the name given to the brown wire?

• Neutral Wire

• Earth Wire

• Live Wire

The fuse in a circuit melts when:

• An appliance isn't earthed
• Too much current flows
• Too much voltage flows

What is the purpose of the earth wire in a three pin plug?

• To provide a return path for the current to the power station
• To provide a return path for the current to the earth in case of electrical fault
• To provide the electric current to the device

A device that contains a thin strip of metal that melts easily if the current in the circuit is too high

• Fuse

• resistor

• earth wire

• battery

Is an assembly of one or more electrical conductors, usually held together with an overall sheath

• Conductor

• Cable

• Insulator

• None of them

Select the cable categories (more than one answer)

• Private cable

• Power cable

• Control cable

• Special cable

Contains one to four cores with copper or aluminum and surrounding by insulation materials

• Special cable

• Power cable

• Control cable

• Private cable