Full name: ampere
Plural form: amperes
Alternate spelling: amps
Category type: electric current
Scale factor: 1
The SI base unit for electric current is the ampere.
Valid units must be of the electric current type.
You can use this form to select from known units:
I'm feeling lucky, show me some random units
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".