REACTANCE AND IMPEDANCE - R, L, AND C

Chapter 5 REACTANCE AND IMPEDANCE { R, L, AND C

Lessons In Electric Circuits Volume II – AC Book
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Summary of Contents

Lessons In Electric Circuits Volume II – AC Book

  • Chapter 5REACTANCE ANDIMPEDANCE – R, L, AND CContents 106,5.1 106,Review 106,of 106,R, 106,X, 106,and 106,Z . . . . . . . . . . . . . . . . . . . . . . . . . . . .97 107,5.2 107,Series 107,R, 107,L, 107,and 107,C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98 113,5.3 113,Parallel 113,R, 113,L, 113,and 113,C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 117,5.4 117,Series-parallel 117,R, 117,L, 117,and 117,C . . . . . . . . . . . . . . . . . . . . . . . . . 108 125,5.5 125,Susceptance 125,and 125,Admittance . . . . . . . . . . . . . . . . . . . . . . . . 116 126,5.6 126,Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 126,5.7 126,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1175.1Review of R, X, and ZBefore we begin to explore the effects of resistors, inductors, and capacitors connected together inthe same AC circuits, let’s briefly review some basic terms and facts.Resistance is essentially friction against the motion of electrons. It is present in all conductorsto some extent (except super conductors!), most notably in resistors. When alternating current goesthrough a resistance, a voltage drop is produced that is in-phase with the current. Resistance ismathematically symbolized by the letter “R” and is measured in the unit of ohms (Ω).Reactance is essentially inertia against the motion of electrons. It is present anywhere electricor magnetic fields are developed in proportion to applied voltage or current, respectively; but mostnotably in capacitors and inductors. When alternating current goes through a pure reactance, avoltage drop is produced that is 90o out of phase with the current. Reactance is mathematicallysymbolized by the letter “X” and is measured in the unit of ohms (Ω).Impedance is a comprehensive expression of any and all forms of opposition to electron flow,including both resistance and reactance. It is present in all circuits, and in all components. When97