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



280 watt per day
280*30  watts in 30 days =8407 watts
 in kilowatts =8407/1000 =8.407 kilowatts in 30  days.
therefore  8.407 kilowatts of energy will be consumed in 30 days


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