![]() ![]() The electron gun shoots a high-energy beam of electrons toward a phosphorescent screen, creating a bright spot that appears where the beam hits the screen.Ī full screen image is formed when the electron beam is deflected in the vertical and horizontal directions either by magnetic fields or the electrostatic effect of electrodes within the tube. This is currently done with a cathode-ray tube, which contains an electron gun that must be operated at a high voltage. A television is an electronic system that produces images on a screen. Methods of amplifying electronic signals and the formulation of the electronic scanning principle became the basis of modern television. In 1900-1920 early versions of the picture tube started appearing. In 1884, a German scientist, Paul Nipkow proposed the first workable television system. The experimentation of creating a television system began in the late Nineteenth Century. "One should stress the fact that the electron beam consists of a large number of negatively charged electrons moving at a good fraction of the speed of light (about 0.25 c for a typical acceleration voltage of 17 kV)." Physics Demonstrations University of Wisconsin, Madison. "TVs and monitors may have up to 35 KV on the CRT but the current is low - a couple of milliamps." "In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 25,000 V." "Therefore, a design Center Maximum Rating of 16,000 volts is equivalent to and absolute maximum rating of 17,600 volts."Ĭutnell, John D. Master Receiving-Picture Tube Substitution Guide Book. "A supply of some 3,000-6,000 volts is needed for the final anode lower voltages for the other anodes."
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