ampere-hour


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ampere-hour

[′am‚pir ¦au̇·ər]
(electricity)
A unit for the quantity of electricity, obtained by integrating current flow in amperes over the time in hours for its flow; used as a measure of battery capacity. Abbreviated Ah; amp-hr.

ampere-hour

A current flow for one hour measured in amperes (amps). Abbreviated "Ah" and commonly called "amp-hour," it is widely used to rate how long it takes for a battery to discharge. For smaller batteries, a milliampere-hour (mAh) rating is used. For example, a 500 mAh battery means it will release 500 milliamps of current at a specific voltage for one hour before it is discharged. See ampere.


Amp-Hours and Watt-Hours
Batteries can be rated in amp-hours (Ah) or watt-hours (Wh) as shown in these examples for a digital camera. The bottom battery is equivalent to 3.3 Wh, while the top battery is equivalent to 667 mAh.
References in periodicals archive ?
The author appears not to know the difference between amperes (amps) and ampere-hours (amp-hrs).
Ultralife's 5390 boasts a capacity of 11.1 ampere-hours of current, compared to 7.2 for its latest 5590, according to Ultralife spokesman Julius Cirin.
According to the company, the SFC A50, which weighs approximately seven kilograms, is capable of providing a daily output of 100 ampere-hours and is being touted for use in recreational vehicles and mobile homes.
The MP 174865 delivers 4.6 ampere-hours of power at 3.6 volts and weighs 121 grams.
IEEE defines the end of useful life for a battery as the point when it can no longer supply 80% of its rated capacity in ampere-hours. Because the relationship between amp-hours and load protection time is not linear, a 20% reduction in capacity results in a much greater reduction in protection time.
A moderately hybrid system, which consists of a starter-generator (BAS) and a lithium-ion battery with a capacity of 10 ampere-hours, saves up to 0.7 liters of fuel per 100 kilometers.
Upon installation, the device records a vehicle's ampere-hours (Ahr) used.