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The kilowatt hour (symbol kWh, kW·h, or kW h) is a derived unit of energy equal to 3.6 megajoules.〔 Thompson, Ambler and Taylor, Barry N. (2008). (''Guide for the Use of the International System of Units (SI)'' ) (Special publication 811). Gaithersburg, MD: National Institute of Standards and Technology. 12. 〕〔 "Half-high dots or spaces are used to express a derived unit formed from two or more other units by multiplication." Barry N. Taylor. (2001 ed.) (''The International System of Units.'' ) (Special publication 330). Gaithersburg, MD: National Institute of Standards and Technology. 20. 〕 If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the product of the power in kilowatts and the time in hours. The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities. ==Definition== The kilowatt-hour (symbolized kW⋅h) is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. :: One watt is equal to 1 J/s. One kilowatt-hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour. Note that the international standard SI unit of energy is the joule. The hour is a unit of time "outside the SI",〔 so the kilowatt-hour is a non-SI unit of energy. It is not listed among the non-SI units accepted by the BIPM for use with the SI. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kilowatt hour」の詳細全文を読む スポンサード リンク
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