Kilowatt hour (kWh):
The kilowatt hour, or kilowatt-hour, (symbol kW·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.
The kilowatt hour, or kilowatt-hour, (symbol kW·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.
Examples:
A heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt hour (equivalent to 3.6 megajoules) of energy.
Using a 60 watt light bulb for one hour consumes 0.06 kilowatt hours of electricity. Using a 60 watt light bulb for one thousand hours consumes 60 kilowatt hours of electricity. Really interesting site on how much energy computers use: http://michaelbluejay.com/electricity/computers.htmlWhats a Kill a Watt? The Kill A Watt is an electricity usage monitor marketed by P3 International. It features a large LCD display and it enables cost forecasting. It measures the energy used by individual appliances plugged into the meter, as opposed to in-home energy use displays, which display the energy used by an entire household. The name is a play on the word kilowatt.
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