Transferring Electrical Energy Worksheet Page 15
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46Q10.
(a)
The picture shows a new washing machine.
Complete the following sentence using one of the words in the box.
kinetic
light
sound
A washing machine is designed to transform electrical energy into heat and
......................................................... energy
(1)
(b)
The instruction booklet for the washing machine contains the following information.
Average power
Time taken to
Wash cycle
during cycle
run cycle
HOT
1.5 kW
2 hours
COOL
1.1 kW
1½ hours
FAST
1.0 kW
¾ hour
(i)
Use the following equation to calculate the energy transferred, in kilowatt-hours, to
the washing machine during the HOT wash cycle. Show how you work out your
answer.
energy transferred = power × time
...........................................................................................................................
...........................................................................................................................
Energy transferred = .................................... kWh
(2)
(ii)
Why does it cost more to use the washing machine on the HOT cycle than on the
COOL or FAST cycle?
...........................................................................................................................
...........................................................................................................................
(1)
Page 15 of 46
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