Transferring Electrical Energy Worksheet Page 28
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46(c)
A heater is needed for a small office.
Comparing each type of heater with the other two, give one advantage of using each type
of heater in the office.
oil-filled panel heater .................................................................................................
.....................................................................................................................................
fan heater ....................................................................................................................
.....................................................................................................................................
ceramic heater .............................................................................................................
.....................................................................................................................................
(3)
(Total 6 marks)
Q19.
The picture shows a food processor, which is used to grate, shred, liquidise and mix food.
The table gives some information about the food processor.
Energy input
Electrical
Useful energy
Kinetic
output
Power rating
1200 watts
Efficiency
0.8
(a)
The food processor is used for a total of 30 minutes a day.
Calculate the cost of the energy wasted by the food processor each day.
Electricity costs 15 p per kilowatt-hour.
Write down the equations you use, and then show clearly how you work out your answer.
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
Cost of waste energy = ...................................... p
(4)
Page 28 of 46
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