Basic AC Reactive Components
Figure 8 Series R-C-L Impedance-Phasor
Equations (8-12) and (8-13) are the mathematical representations of impedance in an R-C-L
circuit. Because the difference between XL and XC is squared, the order in which the quantities
are subtracted does not affect the answer.
Find the impedance of a series R-C-L circuit, when R = 6 W, XL = 20 W, and XC
= 10 W (Figure 9).