Excerpt from Hawkins Electrical Guide: Questions, Answers and Illustrations; A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to Acquire a Working Knowledge of Electricity and Its Applications; A Practical Treatise The word alternating - advantages of alternating cur rent - direct current apparatus; alternating current appa rams - disadvantages of alternating current - alternating current principlesflthe sine - application and construc tion of the sine curve - illustrated definitions: cycle, alternation, amplitude, period, periodicity, frequency commercial frequencies advantages of low frequency phase - phase difierence phase displacement syn chromism in phase curves illustrating in phase and out of phase - illustrated definitions: in phase; in quadrature current leading; in quadrature, current lagging in opposition maximum volts and an'rperes average volts and amperes elementary alternator developing one average volt - virtual volts and amperes - efiective volts and amperes relation between shape of wave and form factor - wave form - oscillograph wave form records - What determines wave form - effect of one coil per phase per pole - single phase current; hydraulic analogy - two phase current; hydraulic analogy - two phase current distribution three phase current; hydraulic analogy; distribution inductance the henry inductive and non-inductive coils - hydraulic analogy of inductance inductance coil calculations - ohmic value of induct ance - capacity: hydraulic analogy - the farad - specific inductive capacity condenser connections ohmic value of capacity - lag and lead -mechanical analogy of lagv - lag measurement steam engine analogy of cur rent fiow at zero pressure reactance examples choking coil impedance curve resonance critical frequency skin efiect. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.