JAMB Physics 2010 Objective — Question 38

Question 38 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.

38. In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1 kWh is sold at N40, the cost of keeping the bulb lighted for a day is A. N192.00 B. N1.92 C. N19.20 D. N920.00

A. N192.00Correct
B. N1.92
C. N19.20
D. N920.00

Explanation

Power=200W=0.2Kw, t=1day=24hrs. Energy = Power x time = (0.2 x 24)Kwh = 4.8Kwh. Since 1Kwh is N40, 4.8Kwh will cost N(40x4.8)=N192.

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