Transferring Electrical Energy Worksheet Page 9
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46Q7.
A castle is a long way from the nearest town. Batteries power the car park ticket machine.
Solar cells are used to keep the batteries charged.
(a)
Complete the following sentences by choosing the correct words from the box.
Each word may be used once or not at all.
chemical
electrical
heat
light
sound
(i)
The energy input to the solar cells is ................................................ energy.
(1)
(ii)
The useful energy output from the solar cells is ........................................ energy.
(1)
(b)
For every 500 J of energy absorbed by the solar cells, 75 J of energy are transferred to the
batteries.
Use the following equation to calculate the efficiency of the solar cells. Show clearly how
you work out your answer.
Efficiency =
.....................................................................................................................................
.....................................................................................................................................
Efficiency = ……………………………
(2)
Page 9 of 46
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