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IMPEDANCE
Impedance in R-L Circuits

Electrical Science Volume 3 of 4
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IMPEDANCE Basic AC Reactive Components where Z   = impedance (W) R  = resistance (W) X  = net reactance (W) The relationship between resistance, reactance, and impedance is shown in Figure 5. Figure 5   Relationship Between Resistance, Reactance, and Impedance The current through a certain resistance is always in phase with the applied voltage.   Resistance is shown on the zero axis.  The current through an inductor lags applied voltage by 90°; inductive reactance is shown along the 90° axis.  Current through a capacitor leads applied voltage by 90°; capacitive  reactance  is  shown  along  the  -90°  axis.    Net  reactance  in  an  AC  circuit  is  the difference  between  inductive  and  capacitive  reactance.    Equation  (8-7)  is  the  mathematical representation for the calculation of net reactance when XL  is greater than XC. X = XL  - XC (8-7) where X   = net reactance (W) XL  = inductive reactance (W) XC  = capacitive reactance (W) ES-08 Page 10 Rev. 0







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