<Tr> <Th> Named after </Th> <Td> Georg Ohm </Td> </Tr> <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>

An ohm is the unit of measurement for