Ac Theory

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  • Topic: Alternating current, Root mean square, Transformer
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  • Published : May 16, 2011
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Fourth Edition, last update June 29, 2002

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Lessons In Electric Circuits, Volume II – AC
By Tony R. Kuphaldt Fourth Edition, last update June 29, 2002

i c 2000-2002, Tony R. Kuphaldt This book is published under the terms and conditions of the Design Science License. These terms and conditions allow for free copying, distribution, and/or modification of this document by the general public. The full Design Science License text is included in the last chapter. As an open and collaboratively developed text, this book is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Design Science License for more details.

PRINTING HISTORY • First Edition: Printed in June of 2000. Plain-ASCII illustrations for universal computer readability. • Second Edition: Printed in September of 2000. Illustrations reworked in standard graphic (eps and jpeg) format. Source files translated to Texinfo format for easy online and printed publication. • Third Edition: Equations and tables reworked as graphic images rather than plain-ASCII text. • Fourth Edition: Printed in November 2001. Source files translated to SubML format. SubML A is a simple markup language designed to easily convert to other markups like L TEX, HTML, or DocBook using nothing but search-and-replace substitutions.

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Contents
1 BASIC AC THEORY 1.1 What is alternating current (AC)? 1.2 AC waveforms . . . . . . . . . . . 1.3 Measurements of AC magnitude . 1.4 Simple AC circuit calculations . . . 1.5 AC phase . . . . . . . . . . . . . . 1.6 Principles of radio . . . . . . . . . 1.7 Contributors . . . . . . . . . . . . 2 COMPLEX NUMBERS 2.1 Introduction . . . . . . . . . . . . 2.2 Vectors and AC waveforms . . . 2.3 Simple vector addition . . . . . . 2.4 Complex vector addition . . . . . 2.5 Polar and rectangular notation . 2.6 Complex number arithmetic . . . 2.7 More on AC ”polarity” . . . . . . 2.8 Some examples with AC circuits 2.9 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 6 12 18 20 22 24 25 25 28 30 32 33 38 40 45 51 53 53 54 59 65 68 70 73 75 75 76 80 85

3 REACTANCE AND IMPEDANCE – INDUCTIVE 3.1 AC resistor circuits . . . . . . . . . . . . . . . . . . . . 3.2 AC inductor circuits . . . . . . . . . . . . . . . . . . . 3.3 Series resistor-inductor circuits . . . . . . . . . . . . . 3.4 Parallel resistor-inductor circuits . . . . . . . . . . . . 3.5 Inductor quirks . . . . . . . . . . . . . . . . . . . . . . 3.6 More on the ”skin effect” . . . . . . . . . . . . . . . . 3.7 Contributors . . . . . . . . . . . . . . . . . . . . . . .

4 REACTANCE AND IMPEDANCE – CAPACITIVE 4.1 AC resistor...
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