Faraday built two devices to produce what he called electromagnetic rotation: that is a continuous circular motion from the circular magnetic force around a wire. Ten years later, in 1831, he began his great series of experiments in which he discovered electromagnetic induction. These experiments form the basis of modern electromagnetic technology. In 1831, using his "induction ring", Faraday made one of his greatest discoveries - electromagnetic induction: the "induction" or generation of electricity in a wire by means of the electromagnetic effect of a current in another wire. The induction ring was the first electric transformer.
1876: Boston civil servant George Carey was thinking about complete television systems and in 1877 he put forward drawings for what he called a "selenium camera" that would allow people to "see by electricity." Eugen Goldstein coins the term "cathode rays" to describe the light emitted when an electric current was forced through a vacuum tube. Late 1870's: Scientists and engineers like Paiva, Figuier, and Senlecq were suggesting alternative designs for "telectroscopes." 1880: Inventors like Bell and Edison theorize about telephone devices that transmit image as well as sound. Bell's photophone used light to transmit sound and he wanted to advance his device for image sending.
Volta’s discoveries would lead the way for Ohm’s law several years later. However, before that discovery was made Hans Christian Ørstead discovered electromagnetism, which was then used by André Marie Amperè to show that magnetism is electricity. Following the publication of Ohm’s law, Faraday would publish his findings on induction in the 1830’s. That same decade the DC generator, and transformer were invented, and followed in the 1840’s by the invention of AC generator. Communications technologies advanced at an incredible pace.
Nikola Tesla Have you ever walked into a room, turned on a light, and wondered, “Who gave us the ability to do this?” Nikola Tesla is the man’s name. He invented Alternating Current, or AC, which is the electrical system that we use to power our world today. In this paper, I will be describing a few of Nikola Tesla’s innovations and how they inspired and impacted our way of life. HISTORY Before I start on his inventions, I will give a bit of history on the man that lit our world. Tesla was born July 10, 1856.
The Three Telegraphs In 1830, an American named Joseph Henry showed the potential of William Sturgeon's electromagnet for long distance communication by sending an electronic current over one mile of wire to activate an electromagnet which caused a bell to strike. In 1837, the British physicists, William Cooke and Charles Wheatstone patented the ... ... middle of paper ... ...em. Telephone Rivals the Telegraph Until 1877, all rapid long-distance communication depended upon the telegraph. A slower and more tedious form of long distance communication was posting letters. It was that very year that a rival technology developed, this device would (again) change the face of communication -- the telephone.
The Vacuum Tube American physicist Lee De Forest invented the vacuum tube in 1906. However, one must look back to 1879 when Thomas Edison first revealed the incandescent electric light bulb to understand how De Forest developed his idea. Edison’s invention consisted of a conducting filament mounted in a glass bulb. Electricity passing through the filament caused it to heat up and created a vacuum that prevented the filament from oxidizing and burning up. In 1883, Edison detected electrons flowing through the vacuum from the lighted filament to a metal plate mounted inside the bulb.
In ancient Greece, Thales observed that an electric charge could be generated by rubbing amber, for which the Greek word is electron. The German physicist Otto von Guericke experimented with generating electricity in 1650, the English physicist Stephen Gray discovered electrical conductivity in 1729, and the American statesman and inventor Benjamin Franklin studied the properties of electricity by conducting his famous experiment of flying a kite with a key attached during electrical storms. However, the first workable device for generating a consistent flow of electricity was invented around 1799 by the Italian inventor Alessandro Volta. Volta’s discovery of a means of converting chemical energy into electrical energy formed the basis for nearly all modern batteries. Beginning his work in 1793, Volta observed the electrical interaction between two different metals submerged near each other in an acidic solution.
Thomas Edison, famed for inventing the light bulb and phonograph, embraced the standard method of direct-current, or DC, power distribution. Produced by batteries and dynamos, DC describes the unidirectional flow of an electrical charge. But George Westinghouse, the electrical engineer who built a fortune by making improvements to America’s railroad system, threw his weight behind the development of a power network based on alternating current, or AC, a more efficient transmission method whose magnitude changes cyclically. Nikola Tesla, one of the most eccentric and prolific electrical engineers in history also was in favor of AC. Tesla, whose work formed the basis of AC power, is one of the most admired pioneers in electrical engineering.
(http://www.ushistory.org/franklin/info/kite.htm). After Franklin, Thomas Edison created light for our homes and businesses, and it was the beginning of great advancements in the electrical industry. Not only did he create the light bulb, but he also invented the microphone, electric pen, telephone receiver, storage battery, and many other inventions before his death. Edison had 1,093 inventions that helped revolutionize of what is today known as electricity (http://www.fi.edu/learn/sci-tech/edison-lightbulb/edison-lightbulb.php?cts=electricity). In the 19th century was when electricity really started and became a widespread of innovations (A,93).
This was a major theoretical discovery, which enabled Edison to invent a "pressure relay" using carbon rather than magnets, which was the usual way to vary and balance electrical currents. In February of 1877 Edison began experiments designed to produce a pressure relay that would amplify and improve the audibility of the telephone, a device that Edison and others had studied but which Alexander Graham Bell was the first to patent, in 1876. By the end of 1877 Edison had developed the carbon-button transmitter that is still used today in telephone speakers and microphones. Many of Thomas Edison’s inventions including the carbon transmitter were in response to demands for new products and improvements. In 1877, he achieved his most unique discovery, the phonograph.