MOST difficult circuit ever made

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Discussion Overview

The discussion revolves around identifying a different resistance in a circuit composed of five identical resistors and one differing resistor. Participants explore methods to determine the unique resistor using an ohmmeter, considering the circuit's symmetry and measurement strategies.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant asks for clarification on the resistances and the points between which the equivalent resistance is to be found.
  • Another participant suggests that the task is to identify the different resistance without cutting wires, using measurements between points in the circuit.
  • A participant notes that the circuit's symmetry means that measurements across identical resistors should yield the same results, while the differing resistor will show a different measurement.
  • There is a suggestion to measure resistances from a symmetrical point to two other points to narrow down the location of the different resistor.
  • Some participants express confusion about the original question and request a clearer statement or the original phrasing.

Areas of Agreement / Disagreement

Participants generally agree on the approach of using symmetry and measurements to identify the different resistor, but there is uncertainty regarding the clarity of the original question and the specifics of the circuit setup.

Contextual Notes

There are limitations in understanding the original question due to potential language barriers and the lack of clarity in the provided circuit diagram. The discussion also reflects varying levels of comprehension among participants.

Who May Find This Useful

This discussion may be useful for students or individuals interested in circuit analysis, particularly in identifying components through measurement techniques and understanding circuit symmetry.

impaxion
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How to find different resistance out of 5 same and one different resistance in circuit.?
image of resistances are shown here
http://www.pictures.pk/viewer.php?id=rgh1210158811g.JPG

in which 5 are same and one is different. how to recognize the different resistance in the circuit through ohm meter

Homework Statement


Homework Equations


The Attempt at a Solution


Homework Statement


Homework Equations


The Attempt at a Solution

 
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Er, what are the resistances? And you want to find the equivalent resistance between which two points?
 
we just have to find the different reistance in the circuit...
 
I'm sorry, but I really don't understand the question. Could you please post the question verbatim?
 
just paste the link starting with pictures.pk and see the figure
 
impaxion said:
just paste the link starting with pictures.pk and see the figure
I have done, but that only shows the diagram. I have no idea what the question is?!
 
I think you are given circuit and the ohmeter and you are told that 5 resistances are identical, while 6th is different - and you have to find this 6th just by measuring resistance between any points in the circuit.

I also suppose you are not allowed to cut wires :wink:

impaxion: is there a preset limit to number of measurements you can make, or not?
 
The circuit is symmetric. If all resistances were equal, the measurement across any of them would show the same result (the resistance in parallel with the rest of the circuit).
Since there is a different resistance, the measurement across it will be different from the other measurements
 
Hootenanny said:
Could you please post the question verbatim?

It might not be in English.

At any rate, I think Borek has provided an accurate phrasing of what is being asked.
 
  • #10
Redbelly98 said:
It might not be in English.

At any rate, I think Borek has provided an accurate phrasing of what is being asked.

Possibly true. It may be too hard for english speakers. I can't figure the problem out and I speak english. But I do agree the problem is pretty clear.
 
  • #11
impaxion said:
we just have to find the different reistance in the circuit...

As drawn the circuit is symmetric along an axis through the center of the drawing. If you make two resistance measurements from a point on the axis to two symmetrical points off of the axis and get the same value, then the 'different resistance' must be one of the resistors that is rotated into itself by the symmetry, otherwise it's one of the others. That narrows the search down. Now find more symmetry axes. This isn't hard. You can really picture the circuit as lying on the edges of a tetrahedron. That's a good question!
 
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