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AC Components and Circuits
AC RL Circuits

Section 3-1 A Look at AC Circuit Analysis

You should know by now that there are two kinds forces that oppose current in a circuit:  resistance and reactance. Resistance is a fixed opposition to current that is created by the molecular structure of the resistor material. Reactance--both inductive and capacitive--is caused by dynamic forces that oppose current flow and are sensitive to the operating frequency of their circuits.

In this lesson, you will begin working with AC circuits that combine resistance and reactance. So what do you call  this combination of resistive and reactive opposition?  It's called impedance.