ELC - Domestic Electricity

What is the colour of the live wire in a three-core flex?

• Blue

• Brown

• Green and yellow stripes

• Red

What is the purpose of the earth wire in an electrical appliance?

• To supply power to the appliance

• To stop the appliance from becoming live

• To increase the appliance's efficiency

• To reduce the appliance's power consumption

Which wire in a three-core flex is colour-coded blue?

• Live wire

• Neutral wire

• Earth wire

• Fuse wire

What happens to the fuse if the current becomes too large?

• It becomes live

• It melts

• It changes colour

• It increases the current

Which of the following appliances might not have an earth wire?

• A double insulated appliance

• A high-power appliance

• An appliance with a metal casing

• An appliance with a plastic casing

What is the equation to calculate the energy transferred by an appliance?

• Energy (kWh) = power (kW) + time (h)

• Energy (kWh) = power (kW) x time (h)

• Energy (kWh) = power (kW) / time (h)

• Energy (kWh) = power (kW) - time (h)

If an appliance has a power rating of 2 kW and is used for 3 hours, how much energy does it transfer?

• 5 kWh

• 6 kWh

• 8 kWh

• 10 kWh

What is the colour of the earth wire in a three-core flex?

• Blue

• Brown

• Green and yellow stripes

• Black

Which of the following is a safety feature in electrical appliances?

• Live wire

• Neutral wire

• Earth wire

• Power switch

What is the unit of power used in the equation for energy transfer?

• Joules

• Watts

• Kilowatts

• Amperes