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Television system of sending and receiving pictures and sound by means of electronic signals transmitted through wires and optical fibers or by Electromagnetic radiation These signals are usually broadcast from a central source a television station to reception devices such as television sets in homes or relay stations such as those used by cable television service providers Television is the most widespread form of communication in the world Though most people will never meet the leader of a country travel to the moon or participate in a war they can observe these experiences through the images on their televisionTelevision has a variety of applications in society business and science The most common use of television is as a source of information and entertainment for viewers in their homes Security personnel also use televisions to monitor buildings manufacturing plants and numerous public facilities Public utility employees use television to monitor the condition of an underground sewer line using a camera attached to a robot arm or remote-control vehicle Doctors can probe the interior of a human body with a microscopic television camera without having to conduct major surgery on the patient Educators use television to reach students throughout the worldPeople in the United States have the most television sets per person of any country with 814 sets per 1000 people in 1994 More than 98 percent of households in the United States have television sets Canada Japan Germany Denmark and Finland follow the United States in the number of sets per personA television program is created by focusing a television camera on a scene The camera changes light from the scene into an electric signal called the video signal which varies depending on the strength or brightness of light received from each part of the scene In color television the camera produces an electric signal that varies depending on the strength of each color of lightThree or four cameras are typically used to produce a television
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