The *admittance* of a circuit tells us how easily current flows.
It is defined as the inverse of impedance.
The unit of admittance is the siemens and the symbol is S.
If Z is impedance,

` ````
Z = R+j(X
```_{L}-X_{C})

and Y is admittance, then

` ````
Y = 1/Z
= 1/R+j(1/X
```_{C}-1/X_{L})

Fischer-Cripps. A.C., *The Electronics Companion.* Institute of Physics, 2005.

Copyright © 2014 Barry Watson. All rights reserved.