Electricity in the Home

In the USA, the frequency of electric current is 60 Hz. In Ireland and Europe, the frequency of electric current is
1. 50 hertz
2. 100 hertz
3. 240 hertz
4. 10 hertz
In the plug top of an electric appliance, what is the colour of the live wire?
1. Brown
2. Black
3. Blue
4. Green/yellow
The green/yellow wire in an electric plug top is known as
1. the earth wire
2. the live wire
3. the blue wire
4. the fuse wire
What are the names of the wires labelled in the diagram?
1. X = neutral, Y = earth
2. X = earth, Y = neutral
3. X = neutral, Y = live
4. X = live, Y = earth
In a domestic fuseboard, a circuit breaker is connected to the
1. live wire
2. earth wire
3. neutral wire
4. neutral and live wires
Another name for the unit of electricity is the
1. kilowatt hour
2. joule
3. ampere
4. watt
Which one of the following uses of electricity is the most costly?
1. A 1.5 kW dishwasher on for 2 hours
2. a 20 watt CD player on for 50 hours
3. An 1800 watt kettle left on for 15 minutes
4. A 70 watt computer system on for 1 day
Which one of the following statements is TRUE?
1. Fuses cannot be used once they blow.
2. Fuses are very expensive to buy.
3. Circuit breakers cannot be reset after an electrical overload.
4. Circuit breakers cannot protect against large amounts of electricity.
Which one of the following appliances costs the least to run for the specified time?
1. A 60 watt laptop running for 5 hours.
2. A 2 kW electric heater for 30 minutes
3. A 200 watt electric blanket left on for 3 hours
4. A 100 watt bulb left on for 8 hours
Name the device shown in the diagram
1. Circuit breaker
2. Fuse
3. Switch board
4. Dashboard
Which one of the following is not used to generate electricity in a power station?
1. plastic
2. gas
3. oil
4. coal
An electric kettle uses 8 amps of electricity when boiling water. Which would be the most appropriate fuse to fit in its plug top?
1. 13 amp
2. 5 amp
3. 3 amp
4. 1 amp
During cold weather a heater is used to heat a large conservatory.
The heater is switched on at a power rating of 1000 watts.
The heater is operated for 8 hours each day for one week. What is the energy in kilowatt-hours used by the heater in this week.
1. 56
2. 5600
3. 7000
4. 8
Which one of the following equations is used for calculating electrical power?
1. P = I × V
2. P = I + V
3. P = V ÷ I
4. P = R × V
An electric kettle operates at 230 V, and has a current of 8 A passing through it.
What is the power rating of this kettle?
1. 1840 W
2. 28.75 W
3. 0.035 W
4. 238 W
A typical power rating for a desktop computer would be
1. 50 W
2. 1000 W
3. 500 W
4. 0.1 W
An electric kettle uses a current of 8.2 amps.
Which one of the following fuses should be placed in its plugtop?
1. 13 amp
2. 5 amp
3. 10 amp
4. 3 Amp
5. 1 Amp
Name the safety device that is placed in a plug.
1. Fuse
2. Switch
3. Resistance
4. Ammeter

Electricity in the Home

Multiple Choice Quiz