Principles of Electrical Engineering

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This third edition has been prepared in order that the text may continue to be abreast, not only of advances in the theory and practice of Electrical Engineering, but also of the advances in teaching methods which have been made since the last edition. Electric power and communication systems continue to increase in scope and in complexity of interconnection. New types of communication channels employing high frequencies have appeared. The thermionic tube has found new and important uses in radio and wire communication, and in highly. diverse applications elsewhere. This trend has emphasized the need for more powerful methods of analysis in connection with the extremely varied electrical circuits now employed. Fundamental physics which forms the basis for electrical engineering has made striking advances. Some of these, particularly in the field of atomistics, have been spectacular. A far better understanding is being secured of the difficult phenomena of the conduction of electricity through gases, liquids, and solids. The physics basis of electrical engineering is becoming more extended and better established. These two trends have necessitated modifications of this text, largely in the direction of further stressing of powerful analytical methods and still greater attention to the manner in which the transition from physics to engineering is accomplished. Since this text is designed primarily for sophomores and juniors in Electrical Engineering, it does not enter into the more advanced physical or electrical engineering theories or make use of mathematics beyond differential equations. Nevertheless it is important that the ground covered should be consolidated in such manner that later advanced work will occasion no abrupt transition in the mind of the student. Starting on ground familiar to the student who has completed a good course in college physics, it therefore develops step-by-step as much electronic theory as is immediately understandable at this stage...