JAMB Physics 2011 Objective — Question 34
Question 34 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.
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If the charge of electricity per kWh is N4, what is the cost of operating an electrical appliance rated 250V, 2A for 6 hours?
- A. A. N16
- B. B. N24
- C. C. N28
- D. D. N12Correct
Explanation
Power = IV = 2x250 = 500W = 0.5kW. Energy = power x time = 0.5x6 = 3kWh. Cost = 3 x N4 = N12.
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