What is Admittance form? All Questions › Category: Circuit Analysis › What is Admittance form? 0 Vote Up Vote Down chetan shidling asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down chetan shidling answered 4 years ago The admittance is a reciprocal of impedance, admittance is a measure of how efficiently a circuit or device will pass a current to flow in the circuit. The SI unit is the siemens (symbol S).