JAMB Physics 2018 Objective — Question 15
Question 15 of 38 from the Joint Admissions and Matriculation Board (JAMB) Physics 2018 Objective paper, with the correct answer and a full explanation.
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An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72hrs if electricity costs ₦2.50 per kwh?
- A. ₦3.6
- B. ₦720
- C. ₦7.20Correct
- D. ₦360
Explanation
Energy = Power×Time = 0.04kW×72h = 2.88kWh. Cost = 2.88×₦2.50 = ₦7.20.
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