Determine resistance of a generator

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  • #1
Ry122
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What formula can I use to determine the resistance of an electrical generator?
 

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  • #2
Ry122
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by resistance i mean the force from the magnets that is slowing down the rotation of the coils.
 
  • #3
Ry122
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since no one has replied i guess its safe to assume its not possible to calculate.
 
  • #4
Hootenanny
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It is most definitely possible to calculate the force, it is a simple application of the the Lorentz force.

Perhaps no one replied because you don't seem to have put any effort into trying to figure it out yourself.
 
  • #5
Ry122
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http://users.on.net/~rohanlal/58c2b8b14b73d2bafeaaafb80b4a5491.jpg [Broken]
This is the Lorentz formula. It requires me to know the electric field,the particle velocity, magnetic field and the electic charge. I know none of these values.
All I know is how many rpm are required for a certain voltage to be generated.
Is it possible to calculate the force generated with just this information?
 
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  • #6
Hootenanny
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You would also know, or could work out the current, which is the rate of flow of charge.
 
  • #7
Ry122
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With that would I be able to determine the other required values?
 
  • #8
Hootenanny
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With that would I be able to determine the other required values?
http://www.physclips.unsw.edu.au/jw/electricmotors.html#mandg" [Broken] is a good reference from the UNSW.
 
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  • #9
Ry122
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It isn't a homemade generator so i don't know the number of windings in the coil or the area of the coil.
 

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