This book focuses on the practical application of specific theorems in solving electrical circuits. Specifically, it covers the theorems of Superposition, Thevenin, Norton, and Maximum Power Transfer. The theory is kept concise, yet all the necessary concepts are explained, and plentiful problems are solved in detail. A vast amount of figures is used for a more effective learning. All in all, this book helps undergraduate and graduate students to develop the necessary skills to solve a broad range of transient exercises. It offers a unique complementary text to classical electric circuit textbooks, for students and self-study, as well.