AC Impedance of a Resistor-Inductor Circuit

In a parallel resistor-inductor (RL) circuit (R/L), the overall AC impedance, ZRIL, can be expressed as 

the real and imaginary components in circuit are given by the AC impedance of a parallel RL 

In the complex plane, the AC impedance of a parallel RL circuit is represented by a semicircle in the first quadrant with a radius of R/2 and the centre at (R/2, 0), as 

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Figure 2.19. Graphical representation of the AC impedance of a series RC circuit 2.4.2 AC Impedance of a Resistor-Inductor Circuit...

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