Excerpt from The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Vol. 2 of 2 The voltmeter has its terminals attached to those of the resist ance through which the current is flowing; or, ii' the standard measuring instrument is sensitive enough, the measured current is sent through the voltmeter itself; and readings of needle or other indicator are taken. In either case the readings are ro portional to the difference of potential between the termina s of the instrument, but in the former arrangement the difference of potential is equal, in volts, to the current in amperes flowing through the resistance multi lied by the value of the resistance in ohms, in the hitter the ditiirence of potential is equal to the measured current through the voltmeter into the resistance between its terminals. 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.