Cube of resistors

  • Thread starter nil1996
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  • #1
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Homework Statement


Here is a cube of resistors with each resistance of value "R".Find the equivalent resistance between A and B.

attachment.php?attachmentid=66606&stc=1&d=1392346578.jpg


Homework Equations





The Attempt at a Solution



My book says the equivalent circuit of the cube is :

attachment.php?attachmentid=66607&stc=1&d=1392346578.jpg


But i don't think it is correct.They have made parallel combinations which don't seem right.Is the book correct??
 

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Answers and Replies

  • #2
phinds
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you need to make your figures smaller. They are HUGE.

I agree w/ you that it doesn't seem correct but I'm guessing they are using some trick of symmetry in the redrawing.
 
  • #3
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The plane through the points ABGH is a symmetry plane, so the potentials of the points D and E must be equal, so you can connect them with a wire. Same for the points C and F.
 
  • #4
301
7
The plane through the points ABGH is a symmetry plane, so the potentials of the points D and E must be equal, so you can connect them with a wire. Same for the points C and F.

O,thanks a lot :smile:
 

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