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siemens (S)
The derived unit of electrical conductance (G) in the SI system of units. The siemens is derived from the SI quantities volt and ampere by the relationship G = I/E, where I is current (measured in amps) and E is electromotive force (measured in volts). The siemens and the ohm are reciprocal to each other, i.e. 1S = 1Ω-1 and 1Ω = 1S-1.
The siemens was formerly known as the mho or reciprocal ohm. It is named after Ernst von Siemens (1816-1892).
[Thanks to Charles Watson for contributons to this entry.]
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