Electricity

What is the unit of an electrical current?

• Ampere

• ohm

• Volt

• Watt

When connected to a supply of 110 Volts and turned on, the resistance of an electric lamp is 220 ohms and a current of 0.5 ampere passes through it. The power of the lamp in watts is?

• 110

• 220

• 55

• 440

What does the following symbol represent in an electric circuit diagram?

• fuse

• resistor

• bulb

• transformer

Which of the following is correct about the way in which the lights and electrical sockets are normally connected in a house?

• series to series

• series to parallel

• parallel to series

• parallel to parallel

Which of the following is NOT a good conductor of electricity?

• water

• Aluminium

• Copper

• Plastic

Plastic is usually used in electrical plugs because plastic

• is a poor conductor of heat

• has a low density

• is fairly strong

• is a poor conductor of electricity

What is the reading on the meter?

• 25487 kWh

• l5 487 kWh

• 16 597 kwh

• 26 487 kWh

Which electrical component is designed to melt and break the circuit if too much

current pass through it

• fuse

• flex

• plug

• switch

The unit of current is

• ohm

• volt

• ampere

• watt

A refrigerator has a rating of 0.45 kW. The 49. Which electrical component is designed

the electricity used, in kWh, by this refrigerator for one day is equal to

• 0.45 kWh

• 0.45/ 24

• 0.45 + 24

• 0.45 x 24