Transferring Electrical Energy Worksheet Page 29
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46(b)
Explain what happens to the waste energy.
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(2)
(Total 6 marks)
Q20.
The instruction booklet for a washing machine contains the following information.
Wash cycle
Average power
Time taken to
during cycle
run cycle
HOT
1.6 kW
2 hours
COOL
1.1 kW
1 ¼ hours
FAST
1.2 kW
¾ hour
(a)
Electricity costs 15 pence per kilowatt-hour.
Calculate, in pence, the cost of using the washing machine for one HOT wash cycle.
Write down the equation you use, and then show clearly how you work out your answer.
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Cost = ................................... pence
(2)
(b)
Why does it cost more to use the washing machine on the HOT cycle than
on the COOL or the FAST cycle?
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(1)
(Total 3 marks)
Page 29 of 46
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