An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance
PHYSICS
WAEC 2015
An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20Ω. Calculate the power loss in the cable.
- A. 120 w
- B. 360 w
- C. 720 w
- D. 2400 w
Correct Answer: C. 720 w
Explanation
Power - IV
I = \(\frac{P}{V}\)
= \(\frac{12000}{2000}\)
I = 6A
Power loss = I\(^2\)R = 6\(^2\) x 20
= 720 W
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