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Television, What It Is, How It Works (In Term Of Physics) And Its Impact On Society, Including Advantages And Disadvantages.

1293 words - 5 pages

Television, our link to the changing world around us. Once thought to be just a passing phase through a quickly advancing society, but now a common innovation in every household. Since the l940s television has become the window on the world for much of industrialized society. Anything the eye can see may be brought to the little screens in living rooms, bedrooms, and kitchens. If television has persisted in offering mindless entertainment, it has also frequently rewarded viewers with outstanding presentations in drama, documentary, and the arts, and it has made such programming available to millions of people across the globe.The television is quite a new piece of technology, but its preparations started much earlier. It was 1873 when the Scottish scientist James Clerk Maxwell predicted the existence of the electromagnetic waves that would make it possible to transmit ordinary television broadcasts. In the same year, the English scientist Willoughby Smith and his assistant Joseph May noticed that the electrical conductivity of the element selenium changes when light falls on it. This property was later given a name, known today as photoconductivity and is used in the vidicon television camera tube. In 1888 another observation was made, by the German physicist Wilhelm Hallwachs, who noticed that certain substances emitted electrons when exposed to light. This effect was given the name photoemission.Between that date and birth date of the television, several methods of changing light into electric current were discovered, but it was some time before the methods were applied to the construction of a television system. Scientists encountered a problem while constructing the television and it was the lack of knowledge they had when it came to amplifying the weak currents that were produced. Then, in 1906, the American engineer Lee De Forest patented the triode vacuum tube. Then by 1920, the tube had been improved to the point where it could be used to amplify electric currents for television.The television developed over many years of refinement. The modern television works in the following way. It begins at a receiving antenna which captures the broadcast wave and carries the signal to the television receiver. Inside the receiver the video and audio signals are separated by special electronic circuits. The audio signal is amplified and converted into sound in the speaker. After amplification the video signal passes into the picture tube, a cathode-ray tube that is the heart of the television receiver. Action begins as the cathode produces a stream of electrons. The picture information of the video signal goes into a grid that regulates the strength of the electron stream. The stream is sent to the deflection plates, which make the beam follow the same path as the scanning beam in the camera tube. One or more anodes speed the passage of electrons in the beam. The face of the picture tube is coated with a phosphorescent material that gives off light...

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