This book allows students to learn fundamental concepts in linear circuit analysis using a well-developed methodology that has been carefully refined through classroom use. Applying his many years of teaching experience, author focuses the reader's attention on basic circuit concepts and modern analysis methods. He systematically unfolds each idea covering studies of basics of different terminologies used in electric circuits, mesh and node equations, network analysis and network theorems. Signals and their properties have been discussed. Graph theory and its application in circuit analysis has been emphasized. Discussed about analogous systems. Fourier transform, Laplace transforms and their applications in circuit theory have been thoroughly discussed. Wide coverage of convolution integral has been made. Two-port networks, passive and active filters, state variable formulation of network problems have been emphasized. Network synthesis has been covered. Transient response and frequency-domain analysis of network systems have been discussed. Some PSPICE program for solved problems has been made. The book consists of lucid presentation of the theoretical aspects of circuit theory and contains large number of solved problems in each chapter for better understanding of the theory. The text has been written in a style to enable students to self study. A large number of objective type questions and solutions to selected problems are given in the appendix. The hallmark feature of this text is that it helps the reader to gain a sound understanding on the basics of circuit theory which helps to understand the courses in higher classes.