ampere-minute

Thân thiện

An engineer records an ampere-minute reading on the instrument panel.

Definition

1. 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.

Học thuật

Noun

1. a unit of charge equal to 60 coulombs