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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.

Definition

Impedance

Impedance is the opposition to AC current by a combination of resistance and  reactance.

The unit of measure for impedance is Ohms (W)
The math symbol for impedance is Z.

 

 

 

 

 

David L. Heiserman, Editor

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All Rights Reserved

Revised: June 06, 2015