Susceptance

In electrical engineering, the susceptance (B) is the imaginary part of the admittance. In SI units, the susceptance is measured in siemens. In June of 1887, Oliver Heaviside used the term "permittance" which later became susceptance.

Mathematics

$Y = G + j B \,$

where

Y is the admittance, measured in siemens

G is the conductance, measured in siemens

$j = \sqrt{-1} \,$

B is the susceptance, measured in siemens.

The admittance (Y) is the inverse of the impedance (Z)

$Y = 1/Z \,$

where

$Z = R + j X \,$

Z is the impedance, measured in ohms

R is resistance, measured in ohms

X is the reactance, measured in ohms.

Note: The susceptance is NOT the inverse of the reactance.

The magnitude of admittance is given by:

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

SI electromagnetism units edit (http://www.biocrawler.com/w/index.php?title=Template:SI_electromagnetism_units&action=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