Physics WAEC

A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?

A. 1k
B. 2k
C. 5k
D. 10k
E. 20k

Correct Answer:

Option B – 2k

Explanation

100W X 10h = 1000Wh = 1KWh thus cost is 2k

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