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Cube of resistors

  1. Feb 13, 2014 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations



    3. 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??
     

    Attached Files:

  2. jcsd
  3. Feb 13, 2014 #2

    phinds

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    Gold Member
    2016 Award

    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.
     
  4. Feb 13, 2014 #3
    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.
     
  5. Feb 13, 2014 #4
    O,thanks a lot :smile:
     
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