- noun a measurement of power with respect to time. One watt-hour is equal to one watt being used for a period of one hour.
- A unit of energy representing the power delivered at a continuous rate of one watt for an interval of one hour. This is equal to exactly 3.6 × 103 joules. Also spelled watthour. Its abbreviation is Wh, or Whr.
- abbreviation Wh
- abbreviation Whr
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