• synonyms


[am-peer-ouuh r, -ou-er, am-peer-]
noun Electricity.
  1. a unit of electric charge noting the amount of electricity transferred by a current of one ampere in one hour, equal to 3600 coulombs. Abbreviation: Ah, amp-hr, amp. hr.
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Origin of ampere-hour

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ampere-hour

Historical Examples of ampere-hour

  • It should register in amperes, one-eighth of the ampere-hour capacity of the battery, as already explained.

    Electricity for the farm

    Frederick Irving Anderson

  • One ampere-hour is simply another way of saying 3,600 coulombs.

British Dictionary definitions for ampere-hour


  1. a practical unit of quantity of electricity; the quantity that flows in one hour through a conductor carrying a current of 1 ampere. 1 ampere-hour is equivalent to 3600 coulombsAbbreviation: a.h.
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012