tailieunhanh - Ebook Electrical Engineering: Principles and Applications

Its goals are to present basic concepts in a general setting, to show students how the principles of electrical engineering apply to specific problems in their own fields, and to enhance the overall learning process. Circuit analysis, digital systems, electronics, and electromechanics are covered. | Electrical Engineering Principles and Applications Fifth Edition UM iW Allan R. Hambley CONTENTS Chapter 1 1 Chapter 2 24 Chapter 3 84 Chapter Chapter Chapter 6 221 Chapter Chapter 8 286 Chapter 9 347 Chapter Chapter Chapter Chapter Chapter Chapter 15. 572 Chapter Chapter Appendix Appendix C. 689 Complete solutions to the in-chapter exercises answers to the end-of-chapter problems marked by an asterisk and complete solutions to the Practice Tests are available to students at hambley CHAPTER 1 Exercises Charge Current X Time 2 A X 10 s 20 C it dt dt 200t X 200cos 200t 2cos 200t A Because 2 has a positive value positive charge moves in the same direction as the reference. Thus positive charge moves downward in element C. Because 3 has a negative value positive charge moves in the opposite direction to the reference. Thus positive charge moves upward in element E. Energy Charge X Voltage 2 C X 20 V 40 J Because Vab is positive the positive terminal is a and the negative terminal is b. Thus the charge moves from the negative terminal to the positive terminal and energy is removed from the circuit element. iab enters terminal a. Furthermore Vab is positive at terminal a. Thus the current enters the positive reference and we have the passive reference configuration. a Pat Va t ia t 20fz 10 10 20t3 10 20t3 Wa f Pa t dt f 20t2dt 2t 2t 6667 J 0 0 3 0 3 b Notice that the references are opposite to the passive sign convention. Thus we have Pb t -vb t ib t 20t - 200 wb fpb t dt 10 20t - 200 dt 10t2 - 200f -1000 J 0 0