Does anyone know, what it is and who would stock it?
We have a very old one, which has 2 metal discs joined by a leather band( a bit like dynamo), with magnet attached to one of the discs.
Teacher wants a newer model
Thanks,
Lada
Faraday's disc
Re: Faraday's disc
Dunna but you can buy Faraday's torches from Jaycar or perhaps Dick Smith. Same principal, different housing.
Cheers, K
- Graham Kemp
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Re: Faraday's disc
Yeap, it is a dynamo. The forerunner of dynamos rather. Invented by Michael Faraday.lada wrote:Does anyone know, what it is and who would stock it?
We have a very old one, which has 2 metal discs joined by a leather band( a bit like dynamo), with magnet attached to one of the discs.
Teacher wants a newer model
Thanks,
Lada
The earliest design consisted of a single rotating conductive disk in a magenetic field, with one brush electrode near the axis and one near the rim. A later refinement used two disc joined by a metallic belt, with the discs in fields of opposed dirrections, so the electrode could be placed near the axis of both (thus reducing friction on the pickup brushes).
It's also called a Homopolar Generator.
- rae
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Re: Faraday's disc
We have a Wimshurst generator. Is it a similar thing??
- Graham Kemp
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- School: St John's School
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- State/Location: QLD
Re: Faraday's disc
No, not quite. Different principle. No magnets involved.rae wrote:We have a Wimshurst generator. Is it a similar thing??
It has two insulating discs, with metal strips inset into their surfaces, rotating in opposite directions (turned by a mechanical handle) passing crossed metal bars, with brushes, which are connected to two metal spheres forming a spark gap. The insets build up electric charge through electrostatic induction, until the accumulated charge is released in a spark.