This “companion” guide helps readers bridge the gap between theoretical principles of alternating current and their practical application in the full range of typical alternating current problems. Assuming only a basic background in the subject, it provides brief technical/theoretical notes, outlines the essential tools, methods, and procedures used to solve problems, and presents carefully detailed solutions to selected problems — highlighting alternative methods, where applicable. Covers alternating current fundamentals, phasor summation of A.C quantities, A.C series circuits, alternating current parallel circuits, power factor improvement, three phase alternating current circuits, the transformer, the alternator, the induction motor, and complex notation - the “j” operator. For anyone who works with alternating current problems.