WATT-HOUR

The watt-hour (symbol W·h or Wh) is a unit of energy. It is most commonly used on household electricity meters in the form of the kilowatt-hour (kW·h or kWh), which is 1,000 watt-hours. It is not used in the International System of Units (SI), despite being based on the watt, as the hour is not an SI unit. The SI unit of energy is the joule (J), equal to one watt-second. It is, however, a commonly used unit, especially for measuring electric energy.1 watt-hour is equivalent to 3,600 joules (1 W x 3600 s), the joule being the canonical SI unit of energy. Thus a kilowatt-hour is 3,600,000 joules or 3.6 megajoules.
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Noun
1. a unit of energy equal to the power of one watt operating for one hour
(hypernym) work unit, heat unit, energy unit
(part-holonym) kilowatt hour, kW-hr, Board of Trade unit, B.T.U.

An electrical energy unit of measure equal to 1 watt of power supplied to, or taken from, an electrical circuit steadily for 1 hour.

watt-hour /'wɔt,auə/
danh từ (điện học) oát giờ
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n. หน่วยกำลังไฟฟ้าจำนวนหนึ่งวัตต์ในเวลาหนึ่งชั่วโมง