This book provides an understandable and effective introduction to the fundamentals of DC/AC circuits. It covers current, voltage, power, resistors, capacitors, inductors, impedance, admittance, dependent/independent sources, the basic circuit laws/rules (Ohm s law, KVL/KCL, voltage/current divider rules), series/parallel and wye/delta circuits, methods of DC/AC analysis (branch current and mesh/mode analysis), the network theorems (superstition, Thevenin s/Norton s theorems, maximum power transfer, Millman s and substitution theorems), transient analysis, RLC circuits and resonance, mutual inductance, transformers, and more. The English version of this book continues in the spirit of its successful Chinese version, which was published by Higher Education Press (the largest and most prominent publisher of educational books in China) in 2005 and reprinted in 2009. Ideal for University students or professionals wishing to gain a good understanding of electrical circuits."