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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
  • E. 20k
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Correct Answer: Option B
Explanation
100W X 10h = 1000Wh = 1KWh thus cost is 2k
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