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Difficult : Calculate equivalent resistance of the circuit problem .

  1. Jun 25, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the total equivalent resistance between A and D -
    r8ibJ.png
    ( All resistors are 1 ohm )

    2. Relevant equations
    -


    3. The attempt at a solution
    The only thing I can see is that the two straight 1 ohm resistors are in parallel , giving 1*1/1+1= 1/2 resistance. But what next , please help !
     
  2. jcsd
  3. Jun 25, 2013 #2

    berkeman

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    Staff: Mentor

    It's not clear what you mean by "the two straight 1 ohm resistors", but try this...

    Since B and C are open circuits for this question, delete their respective 1 Ohm resistors. Then re-draw the circuit, with A at the top and D at the bottom. See if you can draw the resistors in a more normal configuration, using this simplification...
     
  4. Jun 26, 2013 #3

    CWatters

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    Homework Helper

    There are no resistors directly in parallel so the above can't be right.

    Do what berkeman said.
     
  5. Jun 26, 2013 #4
    Okay.
    After deleting those two , I can see two pairs of resistors in series giving 2 each. Then these two 2 ohm resistors are in parallel , giving 1 ohm. Now these is in series with the remaining two 1 ohm resistors giving 3 ohm as the answer. Am I correct ?
     
  6. Jun 26, 2013 #5
    I am sure that you are correct.
     
  7. Jun 26, 2013 #6

    CWatters

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    I agree.
     
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