Household electricity Practice

A fan has a power rating of 0.08 kW. It is switched on for 8 hours a day.

Assuming that one month is 30 days, how much energy does the fan convert in one month? Give your answer in kWh.

• 0.64 kWh

• 2.4 kWh

• 19.2 kWh

• 24 kWh

A computer has a power rating of 150 W.

If it is switched on for 5 hours a day, how much energy does the computer convert in one day?

• 0.75 kWh

• 30 kWh

• 750 kWh

A fridge has a power rating of 2.0 kW.

If 1 kWh of electrical energy costs $0.30, how much does it cost to use the fridge for 24 hours?

• $0.60

• $4.80

• $14.40

A fridge has a power rating of 2.0 kW.

If 1 kWh of electrical energy costs $0.30, how much does it cost to use the fridge for 24 hours each day for 30 days?

• $60

• $432

• $4320

A vacuum cleaner has a power rating of 0.8 kW.

Calculate how much it costs to use a vacuum cleaner for 2 hours every day, for 30 days.

Assume that electricity cost $0.25 per kWh.

• $12

• $15

• $24

A light bulb has a power rating of 100 W. It is switched on for 12 hours a day.

Assuming that one month is 30 days, how much energy does the light bulb convert in one month? Give your answer in kWh.

• 1.2 kWh

• 36 kWh

• 1200 kWh

• 3600 kWh

A water heater has a power rating of 1.2 kW.

If 1 kWh of electrical energy costs $0.30, how much does it cost to use the water heater for 2 hours?

• $0.36

• $0.72

• $0.60