#ampere-hour  a unit of charge equal to 3600 coulombs
  supertype:  #charge_unit__quantity_unit  a measure of the quantity of electricity (determined by the amount of an electric current and the time for which it flows)
  part:  #ampere-minute  a unit of charge equal to 60 coulombs
     part:  #coulomb__c__ampere-second  a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second

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