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Homework Help: Equivalent resistance of tricky circuits?

  1. Feb 12, 2012 #1
    equivalent resistance of tricky circuits???

    1. The problem statement, all variables and given/known data
    what is the equivalent resistance between A and B? img002.jpg


    2. Relevant equations
    kirchoffs law for voltage and current


    3. The attempt at a solution
    i got the equivalent resistance between A to C as 3R/4
    but i have to find the resistance between A to B but point B is in the middle of the circuit and i dont know how to approach it
    i am stuck on this
    please help!!!!!!!
     
    Last edited: Feb 12, 2012
  2. jcsd
  3. Feb 12, 2012 #2

    SammyS

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    Re: equivalent resistance of tricky circuits???

    Hello asifrulzz. Welcome to PF !

    No attachment found !
     
  4. Feb 13, 2012 #3
    Re: equivalent resistance of tricky circuits???

    i have attached the circuit diagram
     
  5. Feb 13, 2012 #4

    gneill

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    Staff: Mentor

    Re: equivalent resistance of tricky circuits???

    What approach have you tried? Can you show your work so far?
     
  6. Feb 13, 2012 #5
    Re: equivalent resistance of tricky circuits???

    i have always calculated equivalent resistance at the ends
    i dont have any idea how i would reach at point B which is in the middle
     
  7. Feb 14, 2012 #6
    Re: equivalent resistance of tricky circuits???

    help please!!!!!!!!!!
    anybody
    thanks in advance
     
  8. Feb 14, 2012 #7

    ehild

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    Re: equivalent resistance of tricky circuits???

    The network of resistors is equivalent with a cube of resistors. You can use that the equivalent points are at equal potential if you connect a voltage source between points A and B, and can be connected with a wire.

    ehild
     

    Attached Files:

    Last edited: Feb 14, 2012
  9. Feb 14, 2012 #8

    ehild

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    Re: equivalent resistance of tricky circuits???

    A step ahead: The points D,E,G of the cube are equivalent and can be connected with a wire. The same holds for J, H, C.

    ehild
     

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