# Resistance of an interesting circuit

fawk3s

## Homework Statement

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

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

## The Attempt at a Solution

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

Saitama
I don't see any picture.

fawk3s
You dont? Thats weird, because I do. Anyway, here's the link:
http://s17.postimage.org/pj88qy16l/vivalaresistance.png [Broken]

Last edited by a moderator:
Saitama
You dont? Thats weird, because I do. Anyway, here's the link:
http://s17.postimage.org/pj88qy16l/vivalaresistance.png [Broken]

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
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fawk3s
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.

Homework Helper
Gold Member
I get that too, taking advantage of the symmetry of the problem.

Saitama
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!