Book excerpt: Assuming readers have a basic understanding of algebra and trigonometry, Simpson offers a concise and practical overview of the basic principles, theorems, circuit behavior and problem-solving procedures of this intriguing and fast- paced science. The main goal of the text is to make what can be difficult subject matter substantially more accessible, retainable and usable. This book takes the first 18 chapters of Simpson's "Principles of DC/AC Circuits" and adds 5 chapters of devices coverage.