Electricity, the Science of the Nineteenth Century, Vol. 2 (Classic Reprint) PDF Download

Author: Emma Marie Caillard
Publisher: Forgotten Books
ISBN: 9780282163327
Category : Technology & Engineering
Languages : en
Pages : 74

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Book Description
Excerpt from Electricity, the Science of the Nineteenth Century, Vol. 2 It must not be supposed that induction currents show themselves only in wires. Solid bars or masses of metal of any shape are sus ceptible of them, and a magnet moved in the neighborhood of a lump or plate of metal, or the starting or stopping of an electric cur rent near it induces in it currents which, owing to the resistance they encounter, very rapidly transform their energy into that of heat, and while they last tend to stop the motion of the magnet which gave rise to them. This they do in accordance with a law, known as lenz's law, from the name of its formulator, by which all induced currents flow in such a direction that their reaction tends to stop the motion producing them. They thus, in fact, offer a mechanical resist ance, which is experienced by any conductor constrained to move across the lines of force in a magnetic field. A curious and striking instance can be given of this by suspending a metal disc by a twisted thread, between the poles of two powerful electro-magnets. While the magnets are inactive the disc revolves rapidly through the nu twisting of the thread, but directly the current passes through the coils the disc stops dead, and if forcibly compelled to rotate, grows rapidly hot, showing how powerful is the resistance encountered. 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.