You are here:About>Business & Finance>Inventors> Famous Inventors> Inventor Biography Sites> Inventors A to Z Listings> S Start Inventors> Eectromagnet
About.comInventors
Electromagnet
An electromagnet is a device in which magnetism is produced by an electric current.

British electrician, William Sturgeon invented the electromagnet in 1825. The first electromagnet was a horseshoe-shaped piece of iron that was wrapped with a loosely wound coil of several turns. When a current was passed through the coil; the electromagnet became magnetized and when the current was stopped the coil was de-magnetized. Sturgeon displayed its power by lifting nine pounds with a seven-ounce piece of iron wrapped with wires through which the current of a single cell battery was sent.

Sturgeon could regulate his electromagnet; this was the beginning of using electrical energy for making useful and controllable machines and laid the foundations for large-scale electronic communications.

Five year later an inventor called Joseph Henry - made a far more powerful version of the electromagnet. American, Joseph Henry (1797-1878), demonstrated the potential of Sturgeon's device for long distance communication by sending an electronic current over one mile of wire to activate an electromagnet which caused a bell to strike. Thus the electric telegraph was born.

William Sturgeon : 1783 - 1850
Joseph Henry's Contributions to the Electromagnet and the Electric Motor
Magnetic Fields: History


image Library of Congress

©Mary Bellis
 

From Mary Bellis,
Your Guide to Inventors.
FREE Newsletter. Sign Up Now!
Newsletters & RSSEmail to a friendSubmit to Digg
 All Topics | Email Article | | |
Advertising Info | News & Events | Work at About | SiteMap | Reprints | HelpOur Story | Be a Guide
User Agreement | Ethics Policy | Patent Info. | Privacy Policy©2008 About, Inc., A part of The New York Times Company. All rights reserved.