Question

If 1 kW h of energy costs Rs 10. How much it cost to use 400 W of light bulb for 5 hours?

Answer 1

Explanation:

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Answer 2

Answer:

1kwh (1000 watt) costs Rs.10

Therefore, 400 watt per hour costs Rs.4 (10/{400/1000} = 10/2/5 = 4)

So, 400 W of light bulb for 5 hours will cost = 4*5 = Rs.20

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