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Crookes tube ?

  1. May 2, 2010 #1
    If i have a light bulb , and it has a tungsten filament and when i turn it on its gets hot ,
    If i hook a lead to the filament and then put the anode away from the filament can i get electrons to flow through the vacuum , assuming this is done with DC current. If we used 2 different power supplies one to heat it and the other to create a potential difference.
  2. jcsd
  3. May 2, 2010 #2


    User Avatar

    Staff: Mentor

    Do you mean like a heated filament in a CRT (TV picture tube)?
  4. May 2, 2010 #3
    yes i do
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