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WAEC Physics 2015 Paper
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© africaexams.com
Question : 36
Total: 50
An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20
Ω
. Calculate the power loss in the cable.
120 w
360 w
720 w
2400 w
Validate
Solution:
Power - IV
I =
P
V
=
12000
2000
I = 6A
Power loss = I
2
R = 6
2
x 20
= 720 W
© africaexams.com
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