Worksheets1.4 Cost of electricity
Total questions: 8
Worksheet time: 4mins
A kettle has a power of 2500 W. What's the power in kW?
250 kW
2.5 kW
25 kW
0.25 kW
A kettle has a power of 2.5 kW, how much energy is used if it takes 1 minute to boil the water inside?
(Energy in joules = Power in watts x Time in seconds)
2.5 J
150 000 J
2500 J
150 J
If a 4 kW oven was on for 2h cooking a joint of beef, how many units (kWh) of electrical energy were used?
8 kWh
4 kWh
2 kWh
0.5 kWh
If the oven used 8kWh of electrical energy and each kWh was 34p, calculate the cost.
272 p
£272
2.72 p
£27.20
How many units (kWh) does a 45 W light bulb use if left on all day and night?
1.08
10.8
45
1080
Gloria is worried. She left the heater on in her room from 8 a.m. to 4 p.m. It is a 2kW heater. If the electricity cost 30 p per unit, how much did her mistake add to the family electricity bill (in pence)?
(a)
Which of the following appliances costs more to run?
3kW Cooker for 2h
200W PlayStation for 12h
10 x 50W light bulbs for 6h
850W Washing machine for 3h
How much does it cost to use a 2000 W electric fire for 45 min if electricity costs 34p pence per unit? (in pence)
(a)
