Lessons in Electric Circuits was compiled from years of lecture notes and ideas, with the primary goal was to put readable, high-quality information of industrial electronics into the hands of students, yet keep the book as affordable as possible. This book was written to be a good enough book without delving too heavy on the math, while still maintaining a lot of important information. As one of the standard undergraduate texts in signals and linear systems theory, this manual is geared toward an advanced undergraduate student with a strong background in calculus and a previous introductory course in differential equations.