**Full name:** ampere

**Plural form:** amperes

**Symbol:** A

**Alternate spelling:** amps

**Category type:** electric current

**Scale factor:** 1

The SI base unit for electric current is the ampere.

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In physics, the ampere (symbol: A, often informally abbreviated to amp) is the SI base unit used to measure electrical currents. The present definition, adopted by the 9th CGPM in 1948 is: "one ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one metre apart in vacuum, would produce between these conductors a force equal to 2 × 10^{-7} newton per metre of length".

ampere to electrostatic unit of current

ampere to deciampere

ampere to volt/ohm

ampere to hectoampere

ampere to gaussian electric current

ampere to gilbert

ampere to microampere

ampere to megaampere

ampere to centiampere