15
CHAPTER
Impedance and Admittance
IN THIS CHAPTER, WE’LL DEVELOP A “RIGOROUS” WORKING MATHEMATICAL MODEL FOR COMPLEX impedance. We’ll also learn about admittance, which quantifies how well AC circuits allow (or admit) the flow of current, rather than restraining (or impeding) it.
Imaginary Numbers Revisited
As we learned in Chap. 13, the engineering symbol j represents the unit imaginary number, technically defined as the positive square root of −1. Let’s review this concept, because some people find it difficult to believe that negative numbers can have square roots. When we multiply j by itself, we get −1.
The term “imaginary” comes from the notion that j is somehow “less real” than the so-called real numbers. That’s not true! All numbers ...
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