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24 September, 02:21

If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

A. 6.700 kilowatt-hours

B. 200 kilowatt-hours

C. 8.4 kilowatt-hours

D. 6.7 kilowatt-hours

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  1. 24 September, 02:39
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    B. 200 kW-hrs

    Explanation:

    Energy = power * time

    E = (280 W) (30 days)

    E = (0.280 kW) (720 hrs)

    E ≈ 200 kW-hrs
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