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Are hot objects charged?

  1. Apr 22, 2015 #1
    Because a hot object like a hot metal has a lot of heat flowing through them are they charged? What are some ways to charge objects.
     
  2. jcsd
  3. Apr 22, 2015 #2
    Shuffle your feet on carpeting on a dry day
     
  4. Apr 22, 2015 #3

    jedishrfu

    Staff: Mentor

    I can't say whether the object would be charged however with a lot of heat then electrons could be ejected from the surface but I think if it were grounded then it still wouldn't have a net charge.

    Vacuum tubes work on the same kind of principle of heating a cathode to get electron flow from cathode to anode:

    http://en.wikipedia.org/wiki/Vacuum_tube

    basically the process of thermionic emission:

    http://en.wikipedia.org/wiki/Thermionic_emission
     
  5. Apr 22, 2015 #4
    I was wondering this because I know that when cathode ray tubes are heated they eject electrons. I was postulating that if the internal KE of an object gets hot enough the atoms can collide with so much energy that the object would emit electrons, it looks like you were thinking the same thing as well. I am going to cover thermiomic emission as the last chapter in my AARL electronics book but thank you for telling me what it is. Friend thank you for the reply.
     
  6. Apr 22, 2015 #5
    Another great reply from you. I am honored to have you respond to my thread :nb)
     
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