Annual Examinations For Secondary Schools 2015 (Physics) Worksheets - Department For Curriculum Management Page 8
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12b) A 5 W bulb is connected as shown in the diagram.
i) How much electrical energy is supplied to the bulb in one second? _______________ [1]
ii) Calculate the efficiency of the system if the power input is 10 W, given that the lamp is
at its normal brightness (5 W).
__________________________________________________________________________
________________________________________________________________________[2]
iii) The potential energy of the water in the reservoir is 100 J. Calculate the mass of water
in the reservoir.
__________________________________________________________________________
________________________________________________________________________[2]
c) There is a relationship between the brightness of the bulb and the height of the water
reservoir. In order to find the most appropriate height for the model, the following results
were observed.
Potential Energy (J)
0
2.5
5.0
7.5
10.0
12.5
15.0
Height (m)
0
0.5
1.0
1.5
2.0
2.5
3.0
i) Plot a graph of Potential Energy (J) on the y-axis against Height (m) on the x-axis.
[5]
ii) Underline the correct answer:
From the graph one can conclude that Potential Energy and Height are (directly, inversely)
proportional to each other. This means that the higher the water reservoir the (dimmer,
brighter) the bulb.
[2]
Page 8 of 12
Physics – Form 3 Secondary – Track 2 – 2015
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