Amperioshora

Amperioshora, commonly written ampere-hour (Ah) in English, is a unit of electric charge that represents the amount of charge transferred by a constant current of one ampere flowing for one hour. In coulombs, 1 Ah equals 3600 C. It is not an SI base unit, but it is widely used to express battery capacity and the amount of charge available from a source. In Spanish usage, the unit is called amperio-hora.

Battery capacity is typically quoted in ampere-hours or milliampere-hours (mAh). The energy content depends on voltage: energy in watt-hours (Wh) equals Ah multiplied by the average voltage (Wh = Ah × V). For example, a 2.0 Ah battery at a nominal 3.7 V stores about 7.4 Wh; a 3000 mAh battery at around 3.8 V stores about 11.4 Wh.

Ampere-hours measure electric charge, not energy by itself. The same Ah value can correspond to different energy stores if the battery voltage differs, so Wh is used to compare energy across batteries with different voltages.

Practical considerations include that capacity can vary with discharge rate, temperature, and age. Higher current draws often reduce usable capacity, and aging or harsh temperatures can shorten runtime. Ratings are usually given for a specific discharge rate, often expressed as a C-rate (for example, 1C).

Usage: to estimate how long a device will run on a given battery, divide the capacity (Ah) by the device’s current draw (A), yielding an approximate runtime in hours under ideal conditions.