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Answer: Admittance is a measure of how easily a circuit or device will allow a current to flow. Resistance is a measure of the opposition of a circuit to the flow of a steady current, while impedance takes into account not only the resistance but also dynamic effects (known as reactance). Likewise, admittance is not only a measure of the ease with which a steady current can flow (conductance, G, the inverse of resistance), but also the dynamic effects of susceptance, B, (the inverse of reactance). The term was coined by Oliver Heaviside in December 1887.
In admittance (Y) is the inverse of the impedance (Z). The SI unit of admittance is the Siemens.
Y = Z^{-1} = 1/Z \,
Where - Y is the admittance, measured in siemens
Z is the impedance, measured in ohms
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