Admittance - Conversion From Impedance To Admittance

Conversion From Impedance To Admittance

Parts of this article or section rely on the reader's knowledge of the complex impedance representation of capacitors and inductors and on knowledge of the frequency domain representation of signals.

The impedance, Z, is composed of real and imaginary parts,

where

R is the resistance, measured in ohms

X is the reactance, measured in ohms

Admittance, just like impedance, is a complex number, made up of a real part (the conductance, G), and an imaginary part (the susceptance, B), thus:

,

where G (conductance) and B (susceptance) are given by:

The magnitude and phase of the admittance are given by:

where

G is the conductance, measured in siemens

B is the susceptance, also measured in siemens

Note that (as shown above) the signs of reactances become reversed in the admittance domain, i.e. capacitive susceptance is positive and inductive suceptance is negative.