ampere [A] Unit Converter

Definition of ampere [A] unit

The ampere (A) is the SI base unit of electric current. It measures the rate at which electric charge flows past a point: one ampere equals one coulomb of charge passing each second.

History of ampere [A] unit

The unit is named after André-Marie Ampère, the French mathematician and physicist whose nineteenth-century work helped establish electrodynamics. The ampere was introduced as an international electrical unit in 1893 and later adopted into the SI system in 1960 as one of its seven base units. Originally, its definition relied on the mechanical force between two parallel current-carrying conductors. In 2019, the SI redefined the ampere by fixing the elementary charge at exactly 1.602176634 × 10−19 coulomb, linking current directly to the flow of electrons and other charged particles.

Applications of ampere [A] unit

Amperes are used to specify current in electrical circuits, appliances, batteries, power supplies, and industrial equipment. For example, a phone charger may deliver two amperes, while household circuit breakers are rated to interrupt excessive current. Engineers use amperage to select wires, fuses, connectors, and measuring instruments, ensuring safe operation and appropriate performance.

Complete list of ampere [A] unit conversion

• kiloampere [kA] = 1000 ampere [A]
• milliampere [mA] = 0.001 ampere [A]
• biot [Bi] = 10 ampere [A]
• abampere [abA] = 10 ampere [A]
• EMU of current = 10 ampere [A]
• statampere [stA] = 3.335640951982E-10 ampere [A]
• ESU of current = 3.335640951982E-10 ampere [A]
• CGS e.m. unit = 10 ampere [A]
• CGS e.s. unit = 3.335640951982E-10 ampere [A]