Control systems; open- and closed-loop, continuous and discontinuous systems, feed-back, block diagrams, transfer function, and servomechanism. Effect of feed-back on gain, gain stability, input resistance, output resistance, distortion, and stability. Control motors; D.C, two-phase, and tacho- generators. Time response of first and second order systems. Transducers and error detectors. System response to different inputs using Laplace transform. Applications; frequency control of power system voltage control, speed control of D.C motors, and position control.