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30 July, 13:20

A water pump draws about 9 A when connected to 240 V. What is the cost (with electrical energy at 13 cents per kWh) of running the pump for 16 h? (Give your answer in dollars)

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  1. 30 July, 15:37
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    4.49 dollars

    Explanation:

    i = 9 A, V = 240 V, t = 16 h

    Energy = V x i x t = 240 x 9 x 16 = 34560 W h = 34.56 kWh

    The cost of 1 kWh is 13 cents.

    Cost of 34.56 kWh = 13 x 34.56 = 449.28 cents = 449.28 / 100 = 4.49 dollars
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