Supply of Electrical Energy and Home Wiring System

2-pin plugs are not connected to the earth wire.

• TRUE

• FALSE

Mei Ling got an electric shock while ironing her clothes. The following information shows the steps taken by his brother to help her.

P- Calls an ambulance

Q- Remove electrical source using an insulator

R- Switches off the main power supply

S- Perform mouth to mouth resuscitation if the victim is not breathing.

Which sequence is correct?

• P, R, Q, S

• P, Q, R, S

• R, Q, S, P

• R, Q, P, S

_______ carries electric current to an electrical appliances.

• Neutral wire

• Live wire

• Earth wire

_______ returns electric current to the branch substation.

• Neutral wire

• Live wire

• Earth wire

_______ connects an electrical appliances directly to the Earth.

• Neutral wire

• Live wire

• Earth wire

___________ disconnects the current supply temporarily when it is not needed (such as during repairing damaged wiring).

• ELCB circuit breaker

• MCB circuit breaker

• Main switch

• Electric meter

___________ cuts off the current supply in the house when excessive current flows through it.

• ELCB circuit breaker

• MCB circuit breaker

• Main switch

• Electric meter

___________ measures the electrical energy that is used in the house.

• ELCB circuit breaker

• MCB circuit breaker

• Main switch

• Electric meter

___________ separates the final circuit into the other parts of electrical equipment like air conditioner circuit and controls the quantity of current flows through it.

• ELCB circuit breaker

• MCB circuit breaker

• Main switch

• Electric meter

What is the colour of earth wire?

• Brown

• Red

• Yellow and green stripes

• Blue