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