A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and
PHYSICS
WAEC 1994
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
Correct Answer: B. 2k
Explanation
100W X 10h = 1000Wh = 1KWh thus cost is 2k
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