This early 20th century text provides an overview of the principles of electricity and electro-chemistry. George Singer covers the basics of current, voltage, and resistance, as well as the properties of different types of electrical circuits. The text also explores the chemical reactions that occur in batteries and other electro-chemical devices. A perfect introduction to the world of electrical engineering and chemistry. 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.