Electrical conductance

Electrical conductance is the reciprocal of electrical resistance. The SI derived unit of conductance is the siemens (symbol S, equal to 1/Ω). In September of 1885, Oliver Heaviside coined this term.

Electrical conductance should not be confused with electrical conductivity, which is material specific feature and reciprocal of electrical resistivity.

Conductance, G, is related to susceptance, B, and admittance, Y, by the equation:

$Y = G + j B \,$

where:

Y is the admittance, measured in siemens

G is the conductance, measured in siemens

$j = \sqrt{-1}$ is the imaginary unit

B is the susceptance, measured in siemens

The magnitude of admittance is given by:

$\left | Y \right | = \sqrt {G^2 + B^2}$

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SI units

SI electromagnetism units edit
Name	Symbol	Dimensions	Quantity
ampere (SI base unit)	A	A	Current
coulomb	C	A�s	Electric charge, Quantity of electricity
volt	V	J/C = kg�m²�s⁻³�A⁻¹	Potential difference
ohm	Ω	V/A = kg�m²�s⁻³�A⁻²	Resistance, Impedance, Reactance
ohm metre	Ω�m	kg�m³�s⁻³�A⁻²	Resistivity
watt	W	V�A = kg�m²�s⁻³	Electrical power
farad	F	C/V = kg⁻¹�m⁻²�A²�s⁴	Capacitance
farad per metre	F/m	kg⁻¹�m⁻³�A²�s⁴	Permittivity
reciprocal farad	F⁻¹	kg¹�m²�A⁻²�s⁻⁴	Elastance
siemens	S	Ω⁻¹ = kg⁻¹�m⁻²�s³�A²	Conductance, Admittance, Susceptance
siemens per metre	S/m	kg⁻¹�m⁻³�s³�A²	Conductivity
weber	Wb	V�s = kg�m²�s⁻²�A⁻¹	Magnetic flux
tesla	T	Wb/m² = kg�s⁻²�A⁻¹	Magnetic flux density
ampere per metre	A/m	m⁻¹�A	magnetic induction
ampere-turns per weber	A/Wb	kg⁻¹�m⁻²�s²�A²	Reluctance
henry	H	Wb/A = V�s/A = kg�m²�s⁻²�A⁻²	Inductance
henry per metre	H/m	kg�m�s⁻²�A⁻²	Permeability
(dimensionless)	χ	-	Magnetic susceptibility