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Homework Help: Cathode Ray Tubes

  1. May 25, 2010 #1
    Why does a cathode ray tube (CRT) require a high voltage to operate?
     
  2. jcsd
  3. May 25, 2010 #2
    What part of the CRT circuitry are you referrring to?
     
  4. May 25, 2010 #3
    the input voltage/energy required, so that the cathode ray gun has enough energy to fire the electron/cathode ray.
     
  5. May 25, 2010 #4
    Think of the energy conversions that occur
    PE(eV) to KE(as electrons fly through the tube) to light energy as the electrons strike the screen.
    The accelerating voltage(V) must be big enough such that photons in the required visible region of the spectrum are released.
     
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