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30 July, 00:34

A 4-kW electric heater runs for 2 hours to raise the room temperature to the desired level. Determine the amount of electric energy used in both kWh and kJ.

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  1. 30 July, 03:44
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    Q' = 8 KW. h

    Q'=28800 KJ

    Explanation:

    Given that

    Heat Q = 4 KW

    time, t = 2 hours

    The amount of energy used in KWh given as

    Q ' = Q x t

    Q' = 4 x 2 KW. h

    Q' = 8 KW. h

    We know that

    1 h = 60 min = 60 x 60 s = 3600 s

    We know that W = 1 J/s

    The amount of energy used in KJ given as

    Q' = 8 x 3600 = 28800 KJ

    Therefore

    Q' = 8 KW. h

    Q'=28800 KJ
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