FORM 3: 6.3 Transmission and Distribution of Electricity

Which station is using step-up transformer?

• A

• B

• C

What is the function of live wire?

• To carry electrical current from electrical appliance to substation

• To carry leaked current to the ground

• To carry electrical current from station to electrical appliance

Three phase wiring can supply electricity with a voltage of 415 V or higher. How many number of live wire and neutral wire in a three phase wiring?

• 1 live wire and 1 neutral wire

• 2 live wires and 1 neutral wire

• 1 live wire and 2 neutral wires

• 3 live wires and 1 neutral wire

What is the function of circuit breaker in electrical wiring system?

• To measure the amount of electricity used

• To control the flow of electric current for all circuits in the house

• To disconnect all internal circuits if the supplied current is higher

• To control the amount of electricity supplied to home

What is the name of the wire in blue colour that labelled by number 2?

• Live wire

• Neutral wire

• Earth wire

Which electrical appliance does not need earth wire?

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