Ohm

The ohm (symbol: Ω, the uppercase Greek letter omega) is the unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg Ohm. Various empirically derived standard units for electrical resistance were developed in connection with early telegraphy practice, and the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time, and of a convenient scale for practical work as early as 1861.

This article is about the SI derived unit. For other uses, see Ohm (disambiguation).
ohm
A laboratory one-ohm standard resistor, c. 1917
General information
Unit systemSI
Unit ofelectrical resistance
SymbolΩ
Named afterGeorg Ohm
Conversions
1 Ω in ...... is equal to ...
   SI base units   kg⋅m2⋅s−3⋅A−2

Following the 2019 redefinition of the SI base units, in which the ampere and the kilogram were redefined in terms of fundamental constants, the ohm is now also defined as an exact value in terms of these constants.

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