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The siemens (symbol: S) is an SI derived unit of measurement for electric conductance, being the inverse of the ohm (Ω), named after Werner von Siemens.


S = A / V

  • S = Siemens
  • A = Amperes
  • V = Voltage
  • The forumla for computing conductance is as follows:

G = 1 / R = S

  • G = Conductance
  • R = Resistance (Ω)
  • S = Siemens

Example: G = 1 / 6 Ω = 0.1667 S



Mho is a now eccentric name for this unit of electrical conductance, equal to 1 Ω-1. It is derived by spelling ohm backwards. Its symbol is (the upside-down letter Ω). The term siemens is used universally in science and primarily in electrical applications, while mho is used primarily in electronic applications.


SI electricity units

SI electromagnetism units

edit  (http://en.wikipedia.org/w/index.php?title=Template:SI_electromagnetism_units&action=edit)
Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A新 Electric charge, Quantity of electricity
volt V J/C = kg搶2新−3嫂−1 Potential difference
ohm Ω V/A = kg搶2新−3嫂−2 Resistance, Impedance, Reactance
ohm metre Ω搶 kg搶3新−3嫂−2 Resistivity
farad F C/V = kg−1搶−2嫂2新4 Capacitance
farad per metre F/m kg−1搶−3嫂2新4 Permittivity
reciprocal farad F−1 kg1搶2嫂−2新−4 Elastance
siemens S Ω−1 = kg−1搶−2新3嫂2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1搶−3新3嫂2 Conductivity
weber Wb V新 = kg搶2新−2嫂−1 Magnetic flux
tesla T Wb/m2 = kg新−2嫂−1 Magnetic flux density
ampere per metre A/m m−1嫂 magnetic induction
ampere-turns per weber A/Wb kg−1搶−2新2嫂2 Reluctance
henry H V新/A = kg搶2新−2嫂−2 Inductance
henry per metre H/m kg搶新−2嫂−2 Permeability
(dimensionless) - - Magnetic susceptibility

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