Updated to the 2011 National Electrical Code, ELECTRICITY 4: AC/DC MOTORS, CONTROLS, AND MAINTENANCE, 10e delivers practical coverage of the AC/DC motors, controls, and the maintenance portion of electrical theory content. It offers quick access to current information on DC motors, AC motors, motor control, electromechanical and solid-state relays and timers, synchronous motors, installation, sensyn units, motor maintenance, and more. Combining thorough explanations of how systems work with relevant, hands-on examples of electrical system operation, this text will help you develop the troubleshooting skills needed in the field.