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15 April, 15:50

How much energy in Joules (J) would an electric heater that draws 9.5 A when connected to a 120 V supply use if the heater were allowed to run for 2 hours.

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  1. 15 April, 17:16
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    Energy used by heater is 8.21 x 10⁶ J

    Explanation:

    Energy = Power x Time

    Power = Voltage x Current

    Voltage = 120 V

    Current = 9.5 A

    Power = Voltage x Current

    Power = 120 x 9.5 = 1140 W

    Time = 2 hours = 2 x 60 x 60 = 7200 s

    Energy = Power x Time

    Energy = 1140 x 7200

    Energy = 8208000 J

    Energy used by heater is 8.21 x 10⁶ J
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