Ampere-hour
From Wikipedia, the free encyclopedia
An ampere-hour (symbol A h or A·h, sometimes abbreviated as Ah) is a unit of electric charge. One ampere-hour is equal to 3600 coulombs (ampere-seconds), and is the amount of electric charge transferred by a steady current of one ampere for one hour.
The ampere-hour is a unit frequently used in measurements associated with electrochemical process such as electroplating and electrical batteries. Although it is not a direct measure of the energy in a battery (like the joule (J) or watt-hour (W·h)), it is a common rating of how long a battery will last (or in the case of a rechargeable battery, how long it will last when fully charged).
The commonly seen milliampere-hour (mA·h) is one-thousandth of an ampere-hour and is equal to 3.6 coulombs.
A milliampere second 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.[1] The same total dose can be delivered in different time periods depending on the X-ray tube current.
