How can we extract electrons from a closed circuit?

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Offline The Scientist

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Offline syhprum

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How can we extract electrons from a closed circuit?
« Reply #1 on: 15/07/2010 21:14:39 »
If you want Electrons moving unimpeded in a vacuum tube such as a CRT or XRay bulb they can be emitted by a hot cathode or a sharp pointed electrode.
The flow of electrons in a conducting wire is very slow the the energy in the circuit travels in the form of an electromagnetic field. 
syhprum