The siemens (symbol: S) is the SI unit of electrical conductance, the reciprocal of resistance. It was formerly known as the mho (℧). A conductor has a conductance of one siemens when a voltage of one volt produces a current of one ampere. Named after Ernst Werner von Siemens.
Mho
The mho (℧) is an informal unit of electrical conductance, the inverse of the ohm. It is identical in value to the siemens. The name is ohm spelled backwards, and the symbol ℧ is an inverted omega (Ω).
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