Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cathode ray tube ?

  1. Mar 31, 2010 #1
    When my Tv shoots electrons from the cathode ray tube , where do these electrons come from and is it ionizing whatever they come from.
     
  2. jcsd
  3. Mar 31, 2010 #2

    ZapperZ

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    The came from a filament. The electrons are ejected via thermionic emission.

    It is not ionizing for the filament. The filament is connected to ground.

    Zz.
     
  4. Mar 31, 2010 #3
    ok thanks for the answer , so then are the electrons cycled back through the circuit somehow
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook