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(1)A quantitative measure of electric current flow equivalent to one thousand watts being used continuously for a period on one hour; the unit most commonly used to measure electrical energy, as opposed to kilowatt, which is simply a measure of available power. (2)Customer billings for all but the largest consumers are usually based in part or in total on the number of kilowatt-hours of electricity used. The standard unit of current flow used in physics is the joule, but since a joule is only equivalent to one watt-second, kilowatt-hour has become a much more convenient standard. (3)A kilowatt-hour of energy typically costs between two and 20 cents depending on where and when it is purchased and by whom. This much energy will operate a 40-watt lightbulb for a full day, a 19″ colour television for about four hours, a personal computer for 2 and-a-half hours, an electric hairdryer for 30 to 60 minutes, an electric razor for 36 hours, a clothes dryer for 15 minutes, a microfurnace heater for 40 minutes, a clock radio for up to several days, a portable stereo for as long as a week, and a telephone answering machine for as long as a month. (4)The kilowatt-hour is the base unit for nearly all measurements of energy volume both inside and outside the energy industry, although other values are occasionally used



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