JAMB Physics 2013 Objective — Question 40

Question 40 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2013 Objective paper, with the correct answer and a full explanation.

A house has ten 40W and five live 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is ₦5?

A. ₦90
B. ₦50
C. ₦45Correct
D. ₦60

Explanation

Total power = 10×40W + 5×100W = 900W = 0.9kW. Energy = Power×Time = 0.9kW×10hrs = 9kWh. Cost = 9×₦5 = ₦45.

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