# Definition of Ohm

A unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals.

The SI unit of electrical resistance, defined to be the electrical resistance between two points of a conductor when a constant potential difference applied between these points produces in this conductor a current of one ampere. The resistance in ohms is numerically equal to the magnitude of the potential difference.

The unit of electrical resistance, named after the nineteenth-century German physicist Georg Simon Ohm (1789â€“1854), noted for his contributions to mathematics, acoustics, and the measurement of electrical resistance.

Symbol: Î©