Electricity and Energy Quiz

What is the unit of measurement for the total energy transferred by an electrical appliance?

• watts (W)

• kilowatt-hours (kWh)

• kilowatts (kW)

What does the power of an electrical appliance represent?

• the total energy transferred

• the rate at which the appliance transfers energy

• the time the appliance is switched on

• the cost of running the appliance

Which formula is used to calculate the energy transferred by an appliance in Joules?

• energy transferred (J) = power (kW) ÷ time (h)

• energy transferred (J) = power (kW) × time (h)

• energy transferred (J) = power (W) × time (s)

• energy transferred (J) = power (W) ÷ time (s)

A 1500 watt hairdryer is used for 5 minutes (300 seconds). How much energy is transferred?

• 4,500 J

• 450,000 J

• 45,000 J

• 45 J

What do electricity meters record?

• the power of electrical appliances

• the cost of electricity per unit

• the cumulative energy usage in kilowatt-hours (kWh)

• the time appliances are switched on

Which formula is used to calculate the cost of electricity?

• cost = Energy transferred (kWh) + Price per kWh

• cost = Energy transferred (kWh) × Price per kWh

• cost = Energy transferred (kWh) ÷ Price per kWh

• cost = Energy transferred (kWh) - Price per kWh

If electricity costs 25p per kWh and a household uses 400 kWh in a month, what is the total cost?

• £100

• £25

• £1000

• £10

The total energy transferred by an appliance depends on both the ___ and the time the appliance is switched on for.

Which appliance transfers the most energy per second? 

• Clock
• Lamp
• Desktop Computer
• Iron

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts
• 1000 Watts
• 500 Watts
• cannot be determined