<Tr> <Th> In SI base units: </Th> <Td> kg ⋅ m ⋅ s ⋅ A </Td> </Tr> <P> The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm . Although several empirically derived standard units for expressing electrical resistance were developed in connection with early telegraphy practice, the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time and of a convenient size for practical work as early as 1861 . The definition of the ohm was revised several times . Today, the definition of the ohm is expressed from the quantum Hall effect . </P> <P> The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force . </P> <Dl> <Dd> Ω = V A = 1 S = W A 2 = V 2 W = s F = J ⋅ s C 2 = kg ⋅ m 2 s ⋅ C 2 = J s ⋅ A 2 = kg ⋅ m 2 s 3 ⋅ A 2 (\ displaystyle \ Omega = (\ dfrac (\ text (V)) (\ text (A))) = (\ dfrac (1) (\ text (S))) = (\ dfrac (\ text (W)) ((\ text (A)) ^ (2))) = (\ dfrac ((\ text (V)) ^ (2)) (\ text (W))) = (\ dfrac (\ text (s)) (\ text (F))) = (\ dfrac ((\ text (J)) (\ cdot) (\ text (s))) ((\ text (C)) ^ (2))) = (\ dfrac ((\ text (kg)) (\ cdot) (\ text (m)) ^ (2)) ((\ text (s)) (\ cdot) (\ text (C)) ^ (2))) = (\ dfrac (\ text (J)) ((\ text (s)) (\ cdot) (\ text (A)) ^ (2))) = (\ dfrac ((\ text (kg)) (\ cdot) (\ text (m)) ^ (2)) ((\ text (s)) ^ (3) (\ cdot) (\ text (A)) ^ (2)))) </Dd> </Dl>

State and define the si unit of resistance
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