The book comprises of 14 chapters and provides understandable and effective introduction to the fundamentals of DC/AC circuits, including current, voltage, power, resistor, capacitor, inductor, impedance, admittance, dependent/independent sources, 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/node analysis), the network theorems (superposition, Thevenin's/ Norton's theorems, maximum power transfer, Millman's and substitution theorems), transient analysis, RLC circuits and resonance, mutual inductance/transformers, etc. The new edition includes challenging practice problems at the end of each chapter, and three new chapters on quantities and units, magnetism and electromagnetism, and three-phase systems.