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Admittance is denoted by
X
Y
Z
R
Y
Quick Summary: Admittance is defined as the reciprocal of impedance and is denoted by the symbol $Y$. It represents the ease with which electric current flows through an alternating current circuit.
Admittance is defined as the reciprocal of impedance and is denoted by the symbol Y. It represents the ease with which electric current flows through an alternating current circuit.
Y=Z1 — Fundamental definition of admittance
Y=G+jB — Complex admittance form where G is conductance and B is susceptance
In an A.C. circuit, impedance Z=R+jX measures the opposition to current flow. Admittance Y is the mathematical inverse, Y=Z1=G+jB, where G is conductance and B is susceptance. Because impedance is a complex quantity, admittance is also a complex quantity measured in Siemens (S).
The unit of admittance is the Siemens (S), formerly known as the mho (mho).
Admittance is a complex quantity composed of a real part (conductance) and an imaginary part (susceptance).
It simplifies the calculation of A.C. circuits connected in parallel, as admittances add linearly.
Simplifies parallel circuit analysis compared to impedance
Provides a direct measure of circuit conductivity
Less intuitive than resistance/impedance in series circuit analysis
Requires complex number arithmetic
Analyzing parallel RLC circuits
Power system network analysis (Y-bus matrix)
Filter design in telecommunications
Option A (X) denotes Reactance.
Option C (Z) denotes Impedance.
Option D (R) denotes Resistance.
B is correct — Admittance is universally denoted by the symbol Y in electrical engineering notation.
Always remember that while impedances add in series, admittances add in parallel (Yeq=Y1+Y2+...+Yn), making Y the preferred parameter for parallel network analysis.