Knowledge about Television

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  • Television is a popular technology that allows us to watch our favorite TV shows on screen.
  • Television sets receive and display broadcasts of moving images.
  • Televisions also produce sound through speakers.
  • The images on a TV screen refresh fast enough to appear as smooth motion to the human eye.
  • Televisions first went on sale in the late 1920’s.
  • Early television was displayed in black and white.
  • Although the technology was developed earlier, color television sets didn’t become widespread until the 1970’s.
  • The 1980’s saw the arrival of remote controls.
  • Television sets are also used to watch DVD’s and Blu-ray discs, as well as play video games through the use of a console.
  • Video cassettes were used before DVD’s and Blu-ray discs but have been phased out in favor of new technology since the late 1990’s.
  • Early monitors used cathode ray tubes (CRT) but they have since been replaced by thinner screens that use liquid crystal display (LCD) and plasma.
  • Similar to radio, television broadcasts are transmitted at specific frequencies.
  • More recently there has been a change from analog transmissions to digital. The 0’s and 1’s of a digital transmission are like the information stored in a computer, making them more reliable than traditional analog broadcasts.
  • Television broadcasts feature a wide range of programming, everything from news to sports, documentaries, sitcoms, reality TV, drama, movies and commercials.
  • The most watched TV broadcasts are typically global events such as the Olympics and Football World Cup.
  • Broadcasting companies use commercials and subscriptions to earn revenue and pay for the costs of production.
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