Physics Worksheet - Secondary Schools - Directorate For Quality And Standards Education Page 8

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b) 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 12.5 W, given that the lamp is
at its normal brightness (5 W).
__________________________________________________________________________
________________________________________________________________________[1]
iii) Calculate the mass of water which flows through the turbine in one second when the
bulb is working at normal brightness.
__________________________________________________________________________
________________________________________________________________________[3]
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) Show that the value of the gradient of the graph is equal to the weight of water flowing
per second.
__________________________________________________________________________
________________________________________________________________________[2]
Page 8 of 12
Physics – Form 3 Secondary – Track 3 – 2015

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