Resistance of an interesting circuit

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Homework Help Overview

The problem involves determining the equivalent resistance between two points, A and B, in a circuit composed of multiple resistors, each with resistance R. The original poster expresses uncertainty about their approach and the correctness of their answer.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the use of symmetry in the circuit to simplify the problem. Some express their calculated results while questioning the validity of their methods.

Discussion Status

Multiple participants have shared their results, indicating a shared understanding of the symmetry in the circuit. However, there is no explicit consensus on the correctness of the answers provided, and some participants are still seeking confirmation.

Contextual Notes

There is a mention of a missing image that is crucial for visualizing the circuit, which may affect the clarity of the discussion. Additionally, the original poster hints that varying the resistances could lead to a more complex scenario.

fawk3s
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Homework Statement



vivalaresistance.png


So each box in the picture has resistance R. Find the resistance between A and B.

Homework Equations



R=R1+R2
1/R=1/R1+1/R2

The Attempt at a Solution



I got the answer to be 3,5R. But as I am not sure if I approached the problem correctly, I would like to hear what you guys got for the answer.

Thanks in advance
 
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I don't see any picture.
 
You dont? Thats weird, because I do. Anyway, here's the link:
http://s17.postimage.org/pj88qy16l/vivalaresistance.png
 
Last edited by a moderator:
fawk3s said:
You dont? Thats weird, because I do. Anyway, here's the link:
http://s17.postimage.org/pj88qy16l/vivalaresistance.png

Ok, thanks for the link. But i still don't see the image in your main post.
To find the equivalent resistance, you see that there is some kind of symmetry. You can break the circuit as shown in the attachment.
 

Attachments

  • eq.png
    eq.png
    12.2 KB · Views: 462
Last edited by a moderator:
Thats what I did, and got 3,5R. Wasnt sure it was correct. Thanks =)

Guess it would get more interesting if the resistances were different.
 
I get that too, taking advantage of the symmetry of the problem.
 
fawk3s said:
Thats what I did, and got 3,5R. Wasnt sure it was correct. Thanks =)

Guess it would get more interesting if the resistances were different.

You are welcome! :smile:
 

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