ampere-minute
Definition
- Noun:
- A unit of electric charge: An "ampere-minute" is a derived unit of electric charge. It represents the quantity of charge transferred by a steady current of one ampere flowing for one minute.
Usage
- Technical and Scientific Context: This term is used primarily in physics and electrical engineering to quantify electric charge. It is a practical unit for calculations involving currents over moderate time periods.
- Formulaic Expression: The value is defined by the relationship: 1 ampere-minute = 60 coulombs. The coulomb is the standard SI unit of charge.
Examples
- Noun:
- The battery's capacity was rated at 5 ampere-minutes.
- To calculate the total charge, multiply the current in amperes by the time in minutes to get ampere-minutes.
Advanced Usage
- Unit Conversion: The "ampere-minute" is often used as an intermediate step in calculations before converting to the standard SI unit, the coulomb.
- A current of 2 amperes for 30 minutes delivers a charge of 60 ampere-minutes, which is 3600 coulombs.
Variants and Related Words
- Ampere-hour (n): A larger, more common unit of battery capacity, equal to 60 ampere-minutes or 3600 coulombs.
- Smartphone batteries are often rated in milliampere-hours (mAh).
- Coulomb (n): The SI derived unit of electric charge. One coulomb is equal to the charge transferred by a constant current of one ampere in one second.
Synonyms
- Unit of charge: This is a general descriptive synonym, as "ampere-minute" specifies a particular type of unit.
Related Phrases
- Charge transfer: This phrase describes the process that the "ampere-minute" quantifies.
- The experiment measured the total charge transfer in ampere-minutes.
Noun
-
a unit of charge equal to 60 coulombs
