Determine resistance of a generator

Click For Summary

Discussion Overview

The discussion revolves around determining the resistance of an electrical generator, specifically focusing on the forces acting on the generator due to magnetic fields and their impact on coil rotation. The scope includes theoretical considerations and practical applications related to electrical generators.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks a formula to calculate the resistance of a generator, clarifying that they mean the magnetic force slowing down the rotation of the coils.
  • Another participant asserts that it is possible to calculate the force using the Lorentz force, suggesting that the lack of replies may be due to insufficient effort in researching the topic.
  • A participant provides the Lorentz formula but notes that they lack the necessary values such as electric field, particle velocity, magnetic field, and electric charge, only knowing the required rpm for a certain voltage.
  • Another participant mentions that knowing the current could help in determining the other required values.
  • There is a query about whether the current would allow for the determination of the other required values.
  • A reference to a resource from UNSW is provided as a potential aid for understanding the topic further.
  • A participant expresses uncertainty about specific parameters, stating they do not know the number of windings in the coil or the area of the coil since it is not a homemade generator.

Areas of Agreement / Disagreement

Participants do not reach a consensus; there are competing views on the feasibility of calculating the resistance and the necessary information required to do so.

Contextual Notes

Limitations include missing assumptions about the generator's design, dependence on specific definitions of terms like resistance, and unresolved mathematical steps related to the Lorentz force calculation.

Ry122
Messages
563
Reaction score
2
What formula can I use to determine the resistance of an electrical generator?
 
Physics news on Phys.org
by resistance i mean the force from the magnets that is slowing down the rotation of the coils.
 
since no one has replied i guess its safe to assume its not possible to calculate.
 
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.
 
http://users.on.net/~rohanlal/58c2b8b14b73d2bafeaaafb80b4a5491.jpg
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?
 
Last edited by a moderator:
You would also know, or could work out the current, which is the rate of flow of charge.
 
With that would I be able to determine the other required values?
 
Ry122 said:
With that would I be able to determine the other required values?
http://www.physclips.unsw.edu.au/jw/electricmotors.html#mandg" is a good reference from the UNSW.
 
Last edited by a moderator:
It isn't a homemade generator so i don't know the number of windings in the coil or the area of the coil.
 

Similar threads

Engineering How to determine circuit components of ´Mystery Box’ ?
  • · Replies 4 ·
Replies
4
Views
2K
Engineering Electrical energy to empty reservoir with a siphon water pipe
  • · Replies 1 ·
Replies
1
Views
1K
Calculating Copper Wire Gauge for Resistance Thermometer Bridge Circuit
  • · Replies 6 ·
Replies
6
Views
2K
Engineering Finding the Armature Resistance from winding/coil resistance
  • · Replies 1 ·
Replies
1
Views
2K
Signal Generator assignment, Multisim results confuse me
  • · Replies 13 ·
Replies
13
Views
3K
Bending Stress and Shear Stress
  • · Replies 2 ·
Replies
2
Views
4K
Engineering Small Signal Input Resistance of a BJT amplifier
  • · Replies 23 ·
Replies
23
Views
5K
Engineering Give examples of mechanical power transmission failure and solutions for a car
  • · Replies 1 ·
Replies
1
Views
3K
Can Gyms Be Used to Generate Electricity?
  • · Replies 1 ·
Replies
1
Views
2K
Engineering Understanding Rankine Cycle Pressures: Should P2 Equal P3?
  • · Replies 1 ·
Replies
1
Views
2K