Divide watts by 1,000 to get kilowatts per hour. If your electric company charges you 10 cents per kilowatt hour and you run a 1,500-watt space heater for 10 hours, that will cost $1.50.

Electric space heaters for home use are usually rated ... to get the power consumed (in watts), then use the formula. A 1,000-watt vacuum cleaner used one hour per week consumes one kWh of energy.

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