This technical manual provides a detailed introduction to the principles and applications of alternating current (AC) electrical systems. Harry Robert Kempe offers an in-depth exploration of the physical properties of AC electricity, including magnetic fields, capacitance, and inductance. By presenting complex concepts in an accessible and easy-to-understand format, this book is an essential resource for electrical engineers, technicians, and students of electrical engineering. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.