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kilowatt vs. kilowatt-hour

[ kil-uh-wot ]
  1. a unit of power, equal to 1000 watts. Abbreviation: kW, kw
[ kil-uh-wot-ouuhr, -ou-er ]
  1. a unit of energy, equivalent to the energy transferred or expended in one hour by one kilowatt of power; approximately 1.34 horsepower-hours. Abbreviation: kWh, K.W.H., kwhr

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