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21 June, 20:44

Refrigerator A uses 500 watts per hour when the motor is operating. The motor needs to run an average of 12 hours per day, every day, to stay at a constant, cold temperature. This model of refrigerator lasts an average of 20 years before it needs to be replaced and costs $1,000. Each kWh of electricity costs $0.12. How many kilowatt hours (kWh) per year does refrigerator A use

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  1. 21 June, 22:03
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    2190kWh per year

    Explanation:

    Refrigerator A = 500W/hr = 0.5kWh

    Running time per day is 12 hours =

    Life cycle = 20 years

    Cost = $1,000

    kWh of electricity $0.12

    kWh of electricity per year will be 0.5kWh multiplied by 12 hours multiplied by 365 days

    = 0.5kWh X 12 X 365 = 2190kWh per year.
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