JAMB Physics 2017 Objective — Question 14
Question 14 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2017 Objective paper, with the correct answer and a full explanation.
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What is the cost of running seven 40W lamps and five 80W lamps for 12 hours if the electrical energy cost is N7.00kWhr?
- A. A. N80.000
- B. B. N45.36
- C. C. N65.00
- D. D. N57.12Correct
Explanation
Total power = 7x40+5x80 = 280+400 = 680W = 0.68kW. Energy = 0.68x12 = 8.16kWh. Cost = 8.16x7 = N57.12.
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