This book has been designed as a basic text for undergraduate students of electrical, electronics and communication and computer engineering. The book explains both fundamental concepts such as circuit elements, Kirchhoff's laws, network equations and resonance, and relatively advanced topics, namely modern filters, state variable analysis, active RC filters and sensitivity considerations. The book is laid out in a systematic and user-friendly way, consisting of 16 chapters, each with solved examples and practice problems to immediately test the reader's understanding of the subject. There are also over 500 multiple choice questions at the end of the book for the reader to dip into and further assess his grasp of the book.In particular, Prof. Wadhwa deals with the theory and application of Fourier and Laplace transforms, classical and modern filter theory, z-transform for discrete systems and analogous systems, SPICE, and both Foster and Cauer realization. This is the third edition of a successful text book suitable for courses in electrical and computer engineering and also relevant to postgraduates and professional engineers.