milliampereminutes

Milliampereminutes, abbreviated as mA·min, is a unit of electric charge defined as the product of electrical current in milliamperes and elapsed time in minutes. It represents the total amount of charge transferred when a given current flows for a certain period.

In SI terms, 1 mA·min equals 0.001 A multiplied by 60 s, which equals 0.06 coulombs. Consequently, 1 A·min equals 60 coulombs, and 1 mA·h equals 3.6 coulombs. Thus, 1 mA·min is 1/60 of 1 mA·h. This relationship allows easy conversion between common charge-related quantities expressed in different units.

Examples help illustrate the concept: a current of 5 mA for 10 minutes corresponds to 50 mA·min, which is 0.05 A × 600 s = 3.0 coulombs. Similarly, 100 mA sustained for 0.5 minutes also yields 50 mA·min (0.1 A × 30 s = 3.0 C).

Usage and context: the unit is largely historical or specialized, appearing in older literature or certain niche measurements. In modern practice, coulombs or ampere-hours (and their milli- variants) are generally preferred for clarity and standardization. Milliampereminutes can be convenient for quick mental calculations in low-current experiments, but it is not a commonly used SI unit for specification.

See also: coulomb, ampere-minute, ampere-hour, milliampere-hour.