What letter is commonly used to represent susceptance?

In AC circuit theory, impedance (Z) measures the total opposition to current flow and is composed of resistance (R) and reactance (X). The reciprocal of impedance is called admittance (Y), which measures how easily a circuit allows current to flow. Just as impedance has two parts, admittance is also divided into a real part and an imaginary part. The real part of admittance is conductance, represented by the letter G. The imaginary part is susceptance, which is represented by the letter B. Susceptance describes how easily alternating current passes through a capacitance or inductance. Remembering the formula Admittance (Y) = Conductance (G) + j * Susceptance (B) will help you correctly identify these standard abbreviations.