Designed for high school electronics students, this fourth document in a series of six electrical learning activity packages focuses on alternating current-reduced voltage controls. An introductory section gives the objective for the activities, an introduction, and an outline of the content. The remainder of the guidebook is comprised of information sheets and job sheets on topics such as (1) part-winding starting and (2) autotransformer starting. Each job sheet follows a typical format that includes the cbjective, materials, explanation, procedure, and evaluation questions. (LRA)