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siemens

(S, mho)
(SI unit of electrical conductance)

The siemens (S) is a SI unit of electrical conductance, the reciprocal of electrical resistance, and the unit is the reciprocal of the SI unit of resistance, the ohm. The term mho, which is ohm spelled backward, is used by some instead of siemens. Relationships:

C = 1/R = I/V

The siemens is a derived SI unit from the base units kg-1m-2s3A2 (i.e., kilograms, meters, seconds, and amperes).

Two other quantifications, electrical resistivity and conductivity are measures of a material's electrical resistance and conductance characteristics, i.e., how much of a given material produces a certain resistance or conductance. Resistivity is commonly given as ohm-meters (Ω-m), a meter-cube of the material with a resistivity of N ohm-meters has a resistance of N ohms. A material's conductivity is the reciprocal of its resistivity, commonly given as siemens per meter (S/m). (Note that the "distance" indicated by meter, in both resistivity and conductivity, actually indicates the material's cross section divided by its length.)


(physics,unit,electricity,SI)
Further reading:
https://en.wikipedia.org/wiki/Siemens_(unit)
https://en.wikipedia.org/wiki/Electrical_resistance_and_conductance
https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
https://energyeducation.ca/encyclopedia/Electrical_conductance
https://www.electricity-magnetism.org/electrical-conductance/
https://www.allaboutcircuits.com/textbook/direct-current/chpt-5/conductance/
https://www.epa.gov/environmental-geophysics/electrical-conductivity-and-resistivity
https://www.lehigh.edu/~amb4/wbi/kwardlow/conductivity.htm
https://www.bipm.org/en/publications/si-brochure

Referenced by pages:
bolometer
Cooper pair
electromotive force (EMF)
flux freezing
inflated radii
magnetohydrodynamics (MHD)
Mars Polar Lander (MPL)
neutron star (NS)
Ohmic heating
Phoenix
plasma
Reynolds number (Re)
telegrapher's equations
transition edge sensor (TES)

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