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Chapter 9.Sinusoids and Phasors1 The impedance Z of a circuit is the ratio of the phasor voltage V to the phasor current I,measured in ohms().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 AdmittanceChapter 9.Sinusoids and Phasors9.5 Impedance and AdmittanceChapter 9.Sinusoids and Phasors9.5 Impedance and Admittance