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เนื้อหาย่อ : An author can have no greater satisfaction than the knowledge that his book has been accepted by many people throughout the world. Such satisfaction is deepened even more when he has learned that his book has become a standard of educational guidance in the particular field which he has endeavored to cover. these people and institutions, the author would like to ex his appreciation and, at the same time, his hope that this new edition will also be received as warmly. is textbook has been designed to aid in the training of st in electricity and electronics on a vocational-education level. The basic theories of electricity and electronics have been expressed as simply as possible. The Third Edition has been largely rewritten to include the most recent information. Chapters on the vacuum tube and transistors, and three new appendix sections have been added. The Third Edition contains many new photographs, diagrams, and illustrations that show both theory and applications. No attempt has been made to approach the higher technical-education level involy- ing extensive knowledge of mathematics and physics. The author does not believe that vocational training, the purpose of which is to prepare a student for a trade, requires that the student memorize formulas or be capable of solving abstract and involved problems. He does believe, however, that a back- wledge of basic electrical and electronic principles is eatial before a vocational student can enter a specialized feld of ing imn any of the allied fields of electricity or electronics. Hence, purpose of this textbook to prepare the student for further af a practical nature in the specific electrical trade that he may select