Resistance of an interesting circuit

  • Thread starter fawk3s
  • Start date
  • #1
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 Im not sure if I approached the problem correctly, I would like to hear what you guys got for the answer.

Thanks in advance
 

Answers and Replies

  • #2
Saitama
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I don't see any picture.
 
  • #3
fawk3s
342
1
You dont? Thats weird, because I do. Anyway, here's the link:
http://s17.postimage.org/pj88qy16l/vivalaresistance.png [Broken]
 
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  • #4
Saitama
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93
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
    eq.png
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  • #5
fawk3s
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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.
 
  • #6
lewando
Homework Helper
Gold Member
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I get that too, taking advantage of the symmetry of the problem.
 
  • #7
Saitama
4,244
93
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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