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Siemens (unit)
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DEFINITION


For a device with Electrical Resistance ''R'', the Conductance ''G'' is defined as

G = rac1R = rac{I}V,

where
  • ''G'' is the Conductance ,

  • ''R'' is the Resistance ,

  • ''I'' is the Current through the device and

  • ''V'' is the Voltage "drop" (electrical potential difference) across the device.


The unit siemens for the conductance ''G'' is defined by
1 S = 1 A/V = 1 A2/W = 1 kg−1·m−2·s3·A2
=1 Ω-1
= 1 kg−1·m−2·s1·C2.

Example: The conductance of a resistor with resistance 6 ohms is ''G'' = 1/(6 Ω) = 0.16... S.


SI MULTIPLES



MHO


The siemens is equivalent to the now obsolete ''mho'' unit, which was derived from spelling ''ohm'' backwards and written with an upside-down capital ) it is common to incorrectly write the symbol for Second as S instead of s, causing potential confusion.