## SI derived quantity: electric resistance

This category of measurement units is defined by the
"electric resistance" type, which is an SI derived quantity.

## SI unit: ohm

The SI derived unit for electric resistance is the ohm.

## Definition: Ohm

The ohm (symbol: Ω) is the SI unit of electrical impedance or, in the direct current case, electrical resistance, named after Georg Ohm. It is defined as the resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere, the conductor not being the seat of any electromotive force.

## Electric resistance units