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The ampere (/ ˈ æ m p ɛər / AM-pair, US: / ˈ æ m p ɪər / AM-peer; symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb (C) moving past a point per second.
Ampere is the SI unit of electric current, named after French physicist André-Marie Ampère. Learn how it is defined, how it relates to other units of measurement, and how it has changed over time.
- The Editors of Encyclopaedia Britannica
Learn what ampere is, how to convert it, how to calculate it and how to measure it with an ammeter. Find out the unit prefixes, formulas, examples and types of ammeter for electric current.
- 6 min
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May 15, 2018 · Learn about the ampere, the SI unit of electric current, and how it was redefined in 2019 based on the elementary charge of an electron. Find out how the ampere is measured, used and related to other SI units.
Learn the definition, measurement and examples of the ampere, a unit of electric current. Find out how the ampere relates to charge, voltage and resistance in electrical circuits.
