The kilowatt hour, or kilowatt-hour, (symbol \(kW \cdot h\), \(kW h\) or \(kWh\)) is a unit of energy equal to
1000 watt hours or 3.6 megajoules. For constant power, energy in watt hours is the product of power in watts and time in
hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
