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Electrical Engineering 101

Which came fi rst, the chicken or the egg? I was faced with just such a quandary when I set down to create the original edition of this book. The way that I found people got the most out of the topics was to get some basic ideas and concepts down fi rst; however, those ideas were built on a presumption of a certain amount of knowledge. On the other hand, I realized that the knowledge that was to be presented would make more sense if you fi rst understood these concepts—thus my chicken-vs.-egg dilemma | INCLUDES MWNllOMLtM M MỆ KịMlF w MONM PAKKEtf ASHe y Nownos Newnes is an imprint of Elsevier 30 Corporate Drive Suite 400 Burlington MA 01803 USA Linacre House Jordan Hill Oxford OX2 8DP UK Copyright 2009 Elsevier Inc. All rights reserved. No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of the publisher. Permissions may be sought directly from Elsevier s Science Technology Rights Department in Oxford Uk phone 44 1865 843830 fax 44 1865 853333 e-mail permissions@elsevier.com.uk. You may also complete your request online via the Elsevier homepage www.elsevier.com by selecting Customer Support and then Obtaining Permissions. Recognizing the importance of preserving what has been written Elsevier prints its books on acid-free paper whenever possible. Library of Congress Cataloging-in-Publication Data Ashby Darren. Electrical engineering 101 everything you should have learned in school . . . but probably didn t Darren Ashby. p. cm. Includes index. ISBN 978-1-85617-506-7 alk. paper 1. Electric engineering. I. Title. TK146.A75 2009 621.3 dc22 2008045182 British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library. ISBN-13 978-1-85617-506-7 For information on all Newnes publications visit our website at www.books.elsevier.com. 08 09 10 11 12 10 9 8 7 6 5 4 3 2 1 Printed in Canada Working together to grow libraries in developing countries www.elsevier.com I www.bookaid.org I www.sabre.org ELSEVIER Sabre Foundation Preface THE FIRST WORD Wow the success of the original edition of Electrical Engineering 101 has been amazing. I have had fans from all over the world comment on it and how the book has helped them. The response has been all I ever hoped for so much so that I get a chance to add to it and make an even better version. Of course these days you don