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18 October, 22:42

What is the average power consumption in watts of an appliance that uses 5.00 kWh of energy per day? How many joules of energy does this appliance consume in a year?

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  1. 19 October, 02:33
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    (A) power = 0.208 kW = 208 watts

    (B) energy = 6.6 x 10^{9} joules

    Explanation:

    energy consumed per day = 5 kWh

    (a) find the power consumed in a day

    1 day = 24 hours

    power = / frac{energy}{time}

    power = / frac{5}{24}

    power = 0.208 kW = 208 watts

    (b) find the energy consumed in a year

    assuming it is not a leap year and number of days = 365 days

    1 year = 365 x 24 x 60 x 60 = 31,536,000 seconds

    energy = power x time

    energy = 208 x 31,536,000

    energy = 6.6 x 10^{9} joules
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