Development of Electromagnetic technology began with .... electr gener

His demonstration that a changing magnetic field induces an in a nearby circuit showed that mechanical can be converted to electric energy. It provided the foundation for generation, leading directly to the invention of the and the electric motor. The early electric was dominated by the problem of generating electricity on a large scale. Permanent magnets were used to produce the magnetic field in generators until the principle of the was discovered in 1866. (A self-excited generator has stronger magnetic fields because it uses electromagnets powered by the generator itself.) In 1870 , a Belgian manufacturer, built the first practical generator capable of producing a continuous current. Since then, the filament lamp, introduced during the early 1900s, has become the principal form of electric lamp, though more efficient fluorescent gas discharge lamps have found widespread use as well. Electricity took on a new importance with the development of the . Tesla began producing h! is motors in association with the Westinghouse Electric Company a few years after DC motors had been installed in trains in Germany and Ireland. Telephone transmissions by radio waves, the electric recording and reproduction of sound, and television were made possible by the development of the tube. The first telephone transmission via radio signals was made from Arlington, Va., to the Eiffel Tower in Paris in 1915; and a commercial radio telephone service between New York City and London was begun in 1927. electr gener