Transferring Electrical Energy Worksheet Page 27
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46(c)
Two different makes of television, A and B, transform energy at the same rate.
Television A wastes less energy than television B.
Complete the following sentence by drawing a ring around the correct line in the box.
a higher efficiency than
Television A has
television B.
the same efficiency as
a lower efficiency than
(1)
(Total 4 marks)
Q18.
The pictures show three different types of electric heater.
(a)
The ceramic heater is run on full power for 5 hours.
Use the following equation to calculate, in kilowatt-hours, the amount of energy transferred
from the mains to the heater.
energy transferred = power × time
Show clearly how you work out your answer.
.....................................................................................................................................
.....................................................................................................................................
Energy transferred = .............................. kilowatt-hours
(2)
(b)
Which heater will be the most expensive to run on its highest heat setting?
.....................................................................................................................................
(1)
Page 27 of 46
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