Ampere-hour

The quantity of electricity pa ed by a current of one ampere in one hour. It is used by electric power and lighting companies as the unit of energy supplied by them, because they maintain a constant potential difference in their leads, so that only the amperes and hours need measuring or recording to give the energy, viz.: volt-ampere-hours. The same unit is applied to batteries to indicate their potential energy, because they also are a umed to be of constant voltage or electro-motive force.