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18 April, 18:36

You operate a 120 w light bulb for 5 minutes. how much energy did you use?

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  1. 18 April, 21:40
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    Energy use by bulb = 36 kJ

    Explanation:

    Power of bulb = 120 W

    Time of working = 5 minutes = 5 x 60 = 300 seconds.

    Power = Work / Time

    Work = Power x Time

    = 120 x 300

    = 36000 J = 36 kJ

    So. energy use by bulb = 36 kJ
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