Note that these equations do not account for the power required by motorized appliances, such as air conditioners, dishwashers, and refrigerators. For more information about these machines, see our Appliance Energy Estimator . Additionally, these equations assume that the power supply is single-phase, which is typical for most homes. Manufacturers typically indicate the wattage on the back of the appliance. To determine how much it costs to operate an appliance for a month, simply multiply the wattage times the number of hours the appliance is used and divide by 1000 to get the kWhs.
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