Watt-hour
Watt-hour is a unit of energy and does not belong to the Si system. Watt hour is the product of power in watts and time in hours. The kilowatt hour corresponds to 3.6 kilojoules. The partial and multiple units of a watthodine are the microwatt-hour, milliwatt-hour, megawatt-hour, gigawatt-hour, terawatth-hour, petawatt-hour.