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?

  • 1k
  • 2k checkmark
  • 5k
  • 10k
  • 20k

The correct answer is: B

Explanation

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