Admittance

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(XL-XC)
	
      

and Y is admittance, then

	
Y = 1/Z
  = 1/R+j(1/XC-1/XL) 
	
      

References

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