22
•The impedance Z of a circuit is the ratio of the phasor voltage V to the phasor current I, measured in ohms Ω.
where R = Re, Z is the resistance and X = Im, Z is the reactance. Positive X is for L and negative X is for
C.
•The
admittance Y is the reciprocal
of impedance, measured
in siemens (S).
9.5
Impedance and Admittance (1)
