Ampere-hour.html



An ampere-hour or amp-hour (symbol Ah , A·h, A h) is a unit of electric charge, with sub-units milliampere-hour (mAh) and milliampere second (mAs). One ampere-hour is equal to 3600 coulombs (ampere-seconds), the electric charge transferred by a steady current of one ampere for one hour.¹

The ampere-hour is frequently used in measurements of electrochemical systems such as electroplating and electrical batteries.

The commonly seen milliampere-hour (mAh or mA·h) is one-thousandth of an ampere-hour or 3.6 coulombs. Small batteries are often rated in millampere-hours.

A milliampere second (mAs or mA·s) is a unit of measure used in X-ray diagnostic imaging and radiation therapy. This quantity is proportional to the total X-ray energy produced by a given X-ray tube operated at a particular voltage.² The same total dose can be delivered in different time periods depending on the X-ray tube current.

References

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External links

• Batteries - a glossary of common terms.