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The secondary winding is electrically connected to the energy output or load side. There is no electrical connection between the primary and secondary windings. Calculate transformer voltage regulation and efficiency. A transformer is an electrical device that transfers energy from one circuit to another. Electrical Science. Transformers vi. OBJECTIVES. TERMINAL OBJECTIVE. 1.0 Given the type of a transformer, DESCRIBE the operating characteristics and. Transformers: Basics, Maintenance, and Diagnostics. 3 electrical energy between circuits completely insulated from each other. This makes it possible to use (The Electric Power Engineering Series ; 9) Includes bibliographical references and index. ISBN 0-8493-1704-5 (alk. paper) 1. Electric transformers. Preferred for high voltage transformers. Page 7. GE 207/Electrical Machines -I. Part A Single-Phase Transformer.The purpose of a transformer is to change electrical voltage to a different value. For example, a farmer has a large, 480-V, 3-phase motor powering a well.