WAEC Physics 2015 Objective — Question 36
Question 36 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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An electric generator rated 12 kW, 2 kV distributes power through a cable of resistance 20Ω. Calculate the power loss in the cable.
- A. 120 W
- B. 360 W
- C. 720 WCorrect
- D. 2400 W
Explanation
Current I = P/V = 12000/2000 = 6 A. Power loss = I²R = 6²×20 = 720 W.
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