The fourth book in Delmar's Electricity 1-4 series, Electricity 4: AC/DC Motors, Controls and Maintenance, 7E introduces readers to DC and AC motors, as well as many types of manual, magnetic and electronic controls. Throughout this edition, motors are described in detail enabling the reader to develop a working knowledge of the operations, advantages and disadvantages of each type. A wide variety of controls are also explained to aid understanding, while discussion of AC motors and associated controls helps to develop an appreciation of control schemes applied to various applications of the motors. This edition features new and improved photos and diagrams to better enable readers to tie theory and practice together into real-life situations. Any references to the National Electrical Code? have been updated, and some chapter material has also been rearranged to improve continuity. Specific objectives precede the introduction of each topic, while summaries and quiz items enable readers to measure their progress at the end of each chapter.