In electrical engineering, the **admittance** (*Y*) is the inverse or reciprocal of the impedance (*Z*). The SI unit of Admittance is the siemens.

where

*Y* is the admittance, measured in siemens

*Z* is the impedance, measured in ohms

Just as impedance is complex resistance, and the conductance **G** is the inverse **G** = 1/**R** of resistance **R**, admittance is also **complex conductance**.

Likewise, admittance is made up of a real part (the conductance), and an imaginary part (the susceptance **B**), shown by the equation

The magnitude of admittance is given by:

where

*G* is the conductance, measured in siemens

*B* is the susceptance, measured in siemens

## SI electricity units

## External links

- Conductance, Susceptance, and Admittance http://www.geocities.com/SiliconValley/2072/eleccsa.htm

Last updated: 02-08-2005 13:10:00