1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vacuum Jump

  1. Sep 5, 2010 #1
    Is it possible for electricity to jump a vacuum gap? If so, what is it called when that happens?
     
  2. jcsd
  3. Sep 5, 2010 #2
    Yes. Otherwise those old Fleming tubes wouldn't work...
    Arching or conduction depending on the amount of current and suddenness of onset.
    It takes more voltage to get it going since air and moisture make better conduction paths. I seem to remember 30Kv/inch for an electrical arc in a vacuum, but I could be way off.
     
  4. Sep 5, 2010 #3

    mathman

    User Avatar
    Science Advisor
    Gold Member

    Before transistors, radio and TV sets used vacuum tubes, which are based on electron flow.
     
  5. Sep 5, 2010 #4
    In vacuum tubes, the electron current is called thermionic emission and plate current. The current is not visible, but the plates sometimes turn red hot.

    With very high electric field gradients in very vacuum, field emission of electrons is possible, with lots of x-rays as the accelerated electrons hit the other side.

    Bob S
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Vacuum Jump
  1. In a vacuum (Replies: 3)

  2. Jump higher? (Replies: 4)

  3. The physics of a jump? (Replies: 1)

  4. A question about jumping (Replies: 14)

  5. Jumping in a train (Replies: 11)

Loading...