A

David

Darling

ohm (Ω)

The ohm (Ω) is the derived unit of electrical resistance, in the case of direct current, or impedance, in the case of alternating current, in the SI system of units. 1 ohm (Ω) is the resistance that produces a potential difference of one volt when a current of one ampere is flowing through it. It is named after the German physicist Georg Ohm (1789–1854).