22.5 Inductive Reactance


In a simple resistor circuit, we defined resistance R by

V = I R

In a similar fashion, we can write


where VL is the maximum voltage across the inductor and I is the maximum current through the circuit. XL is called the "inductive reactance"; it is analogous to resistance and is also measured in ohms (). The "inductive reactance", XL, is given by

XL, the "Inductive Reactance" plays a role very similar to that of R, the resistance. The inductive reactance is a measure of how difficult it is for current to flow. With AC circuits, this depends upon the frequency.

Capacitive Reactance

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(c) Doug Davis, 2002; all rights reserved