本书以电路基础知识、电路分析方法为主体，辅以典型例题和实际应用实例，并穿插介绍电子工程相关历史人物与知识，旨在改变以往枯燥的电路课程教学，引领新时代教材改革。本书不仅包含详细的例题和习题，还包含PSpice软件仿真内容以及应用实例，旨在帮助学生掌握相关概念和方法的应用。这些特色使本书成为一本明白易懂、内容丰富、条理清晰、富有趣味的教科书。本书不仅可供电类各专业的学生作为教科书使用，还适于自学者使用，以及供有关技术人员、高校教师参考。
本书是美国乃至国际上非常有影响力的电路教材之一，经过五次版本更新，经成为众多学生和老师心目中的经典教材。以电路基础知识、电路分析方法为主体，辅以典型例题，并穿插介绍电子工程相关历史人物与知识，旨在改变以往枯燥的电路课程教学，引*新时代教材改革。
Charles K. Alexander 分别于1967年和1971年获得俄亥俄大学的电气工程学硕士学位和博士学位，目前为美国克利夫兰州立大学Fenn工学院电气与计算机工程系教授以及电子学与航空航天技术研究中心（CREATE）的主任。他是IEEE的会士，曾任IEEE主席和CEO。他于1984年获得IEEE百年纪念奖章，还先后荣获英国工程委员会颁发的杰出工程教育成就奖和杰出工程教育领导奖。
Matthew N. O. Sadiku 博士，美国Prairie View A＆M大学教授，兼任IEEE Transacfions on Education杂志副主编。他曾在朗讯、波音等公司从事研发工作，发表过百余篇学术论文，出版过20余部著作。
Contents
Preface iv
About the Authors xi
PART 1 DC Circuits 2
Chapter 1 Basic Concepts 3
1.1 Introduction 4
1.2 Systems of Units 5
1.3 Charge and Current 6
1.4 Voltage 9
1.5 Power and Energy 10
1.6 Circuit Elements 14
1.7 Applications 16
1.7.1 TV Picture Tube
1.7.2 Electricity Bills
1.8 Problem Solving 19
1.9 Summary 22
Review Questions 23
Problems 24
Comprehensive Problems 26
Chapter 2 Basic Laws 29
2.1 Introduction 30
2.2 Ohm’s Law 30
2.3 Nodes, Branches, and Loops 35
2.4 Kirchhoff’s Laws 37
2.5 Series Resistors and Voltage Division 43
2.6 Parallel Resistors and Current Division 44
2.7 Wye-Delta Transformations 51
Delta to Wye Conversion
Wye to Delta Conversion
2.8 Applications 57
2.8.1 Lighting Systems
2.8.2 Design of DC Meters
2.9 Summary 63
Review Questions 64
Problems 65
Comprehensive Problems 77
Chapter 3 Methods of Analysis 79
3.1 Introduction 80
3.2 Nodal Analysis 80
3.3 Nodal Analysis with Voltage Sources 86
3.4 Mesh Analysis 91
3.5 Mesh Analysis with Current Sources 96
3.6 Nodal and Mesh Analyses by Inspection 98
3.7 Nodal Versus Mesh Analysis 102
3.8 Circuit Analysis with PSpice 103
3.9 Applications: DC Transistor Circuits 105
3.10 Summary 110
Review Questions 111
Problems 112
Comprehensive Problem 124
Chapter 4 Circuit Theorems 125
4.1 Introduction 126
4.2 Linearity Property 126
4.3 Superposition 128
4.4 Source Transformation 133
4.5 Thevenin’s Theorem 137
4.6 Norton’s Theorem 143
4.7 Derivations of Thevenin’s and Norton’s Theorems 147
4.8 Maximum Power Transfer 148
4.9 Verifying Circuit Theorems with PSpice 150
4.10 Applications 153
4.10.1 Source Modeling
4.10.2 Resistance Measurement
4.11 Summary 158
Review Questions 159
Problems 160
Comprehensive Problems 171
Chapter 5 Operational Amplifiers 173
5.1 Introduction 174
5.2 Operational Amplifiers 174
5.3 Ideal Op Amp 178
5.4 Inverting Amplifier 179
5.5 Noninverting Amplifier 181
5.6 Summing Amplifier 183
5.7 Difference Amplifier 185
5.8 Cascaded Op Amp Circuits 189
5.9 Op Amp Circuit Analysis with PSpice 192
5.10 Applications 194
5.10.1 Digital-to-Analog Converter
5.10.2 Instrumentation Amplifiers
5.11 Summary 197
Review Questions 199
Problems 200
Comprehensive Problems 211
Chapter 6 Capacitors and Inductors 213
6.1 Introduction 214
6.2 Capacitors 214
6.3 Series and Parallel Capacitors 220
6.4 Inductors 224
6.5 Series and Parallel Inductors 228
6.6 Applications 231
6.6.1 Integrator
6.6.2 Differentiator
6.6.3 Analog Computer
6.7 Summary 238
Review Questions 239
Problems 240
Comprehensive Problems 249
Chapter 7 First-Order Circuits251
7.1 Introduction 252
7.2 The Source-Free RC Circuit 253
7.3 The Source-Free RL Circuit 257
7.4 Singularity Functions 263
7.5 Step Response of an RC Circuit 271
7.6 Step Response of an RL Circuit 278
7.7 First-Order Op Amp Circuits 282
7.8 Transient Analysis with PSpice 287
7.9 Applications 291
7.9.1 Delay Circuits
7.9.2 Photoflash Unit
7.9.3 Relay Circuits
7.9.4 Automobile Ignition Circuit
7.10 Summary 297
Review Questions 298
Problems 299
Comprehensive Problems 309
Chapter 8 Second-Order Circuits311
8.1 Introduction 312
8.2 Finding Initial and Final Values 313
8.3 The Source-Free Series RLC Circuit 317
8.4 The Source-Free Parallel RLC Circuit 324
8.5 Step Response of a Series RLC Circuit 329
8.6 Step Response of a Parallel RLC Circuit 334
8.7 General Second-Order Circuits 337
8.8 Second-Order Op Amp Circuits 342
8.9 PSpice Analysis of RLC Circuits 344
8.10 Duality 3488.11 Applications 351
8.11.1 Automobile Ignition System
8.11.2 Smoothing Circuits
8.12 Summary 354
Review Questions 355
Problems 356
Comprehensive Problems 365
PART 2 AC Circuits366
Chapter 9 Sinusoids and Phasors 367
9.1 Introduction 368
9.2 Sinusoids 369
9.3 Phasors 374
9.4 Phasor Relationships for Circuit Elements 383
9.5 Impedance and Admittance 385
9.6 Kirchhoff’s Laws in the Frequency Domain 387
9.
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