Re: Van de Graaf Generator
From: Franz Heymann (notfranz.heymann_at_btopenworld.com)
Date: 06/16/04
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Date: Wed, 16 Jun 2004 21:22:53 +0000 (UTC)
"kboris" <kboris@softhome.net> wrote in message
news:3d6cd4.0406160914.37244a8f@posting.google.com...
> Can anybody help to understand the following?
> In the Van de Graaf generator the charge is supplied through the
> pointed or brush electrodes that pass it from the belt to a
relatively
> big conductive sphere. Why cannot that be done through a regular
> electrical contact? Can we install a metallic roller that is
> electrically connected to the inner surface of the big sphere and
> touches the belt? Why do we need an arc for transferring the charge
> from the belt to the sphere?
There is no arc involved in charging the belt of a van de Graaff
machine.
You need free charges to attach themselves to the belt.
If you just let a conductor scrape against the belt, very little
charge would be transferred to the belt, because of the work function
of the conductor.
You need a fine comb of needles kept at a high potential, so that a
brush discharge from them can occur.
Franz
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