Principles of Electrical Circuits and Electronics is a comprehensive textbook designed to introduce readers to the core concepts of electrical engineering and electronics. It presents balanced integration of theoretical understanding and practical skills, catering to students, a engineers, technicians, and enthusiasts alike. The book begins with the fundamentals-Ohm’s Law, Kirchhoff’s laws, and basic circuit components-before advancing to more complex topics such as AC analysis, network theorems, and transient response. A significant portion is devoted to semiconductors, diodes, transistors, and operational amplifiers, forming the bedrock of modern electronic systems. Later chapters explore digital electronics, microcontrollers, and basic power systems, offering a complete view of the field. Written in clear, accessible language, each chapter inchides numerous illustrations, examples, and end-of-chapter exercises to support self-study and classroom instruction. The book also emphasizes safety and best practices, ensuring readers not only understand how circuits work but how to handle them responsibly. Whether used as a primary textbook or supplementary guide, this book equips readers with the knowledge and confidence to analyse, design, and troubleshoot electrical and electronic circuits effectively.