Transferring Electrical Energy Worksheet Page 18
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46(c)
The table gives information about two different fan heaters.
Useful energy
Wasted energy
transferred each
transferred each
second in joules
second in joules
Fan heater L
1200
10
Fan heater M
1200
20
Complete the following sentence by drawing a ring around the line in the box that is
correct.
is more efficient than
Fan heater L
fan heater M.
has the same efficiency as
is less efficient than
(1)
(Total 5 marks)
Q13.
The diagram shows the label from a new freezer.
(a)
An old freezer has an energy consumption per year of 350 kWh.
Use the equation in the box to calculate the extra cost of using the old freezer for one year
compared with using a new ‘A’ rated freezer.
total cost = number of kilowatt-hours × cost per kilowatt-hour
Assume 1 kilowatt-hour (kWh) of energy costs 12 p.
Show clearly how you work out your answer.
.....................................................................................................................................
.....................................................................................................................................
Extra cost per year = £ ..............................
(2)
Page 18 of 46
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