DC Theory, Third Edition, published by the National Joint Apprenticeship and Training Committee (NJATC), is a comprehensive educational resource designed for electricians and electrical students. This edition, copyrighted in 2010, builds a strong foundation in direct current (DC) principles and applications, combining theory with practical examples and safety protocols. It covers the basics of electricity, DC circuits, semiconductors, and magnetism, gradually advancing to more complex topics like DC combination circuits and generators.

This textbook is carefully structured to enhance learning through field notes, chapter objectives, and review questions, encouraging critical thinking and real-world application. Approved for exclusive use by IBEW-NECA JATCs, the book ensures relevant and current industry standards are met. A must-have for apprentices, students, or professionals seeking to deepen their understanding of DC electrical theory and practice.