Vacuum Tube essay


The vacuum tube played a key role in the development of radios, televisions, and computers. The purpose of a vacuum tube is to control the flow of electrons. This can be used to amplify a current, work as a switch, and with the invention of the cathode-ray tube, display an image. The amplification of current allowed radios to receive a signal broadcast from miles away and amplify it for us to hear. Vacuum tubes were also used in the first computers as on/off switches, to perform calculations. Televisions were made possible by a variation of the vacuum tube, the cathode-ray tube. This tube contains multiple anodes, which attract electrons. One focuses the electrons, and one accelerates them, causing them to collide with the phosphor coated screen, which glows to create the images seen on the first TVs. Now knowing about this, it is interesting to think about the TVs in my house when I was younger and compare them to the liquid retina display I am typing this on, that is thinner than a pencil and weighs only a couple pounds.

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