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Homework Help: Problem with circuit

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

    lol.png

    2. Relevant equations
    Req =R1 + R2

    Req = (R1*R2)/(R1 +R2)


    3. The attempt at a solution

    No idea how to do that . Was thinking maybe making the 3 and 2 ohms resistors equivalent (assuming parallel). I have no idea what to do with the top wire . How do I simplify this circuit?
     
  2. jcsd
  3. Sep 13, 2014 #2

    mfb

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    2017 Award

    Staff: Mentor

    The 2 and 3 Ohm resistors are not in parallel (their upper ends are not connected).

    Hint: Re-draw the circuit with the 5 and 20 Ohm resistors in a vertical position.
     
  4. Sep 13, 2014 #3

    gneill

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    Staff: Mentor

    You're allowed to re-arrange the components on the page so long as all the connections remain the same. Take a close look at how the 5 and 20 Ohm resistors are connected. Better yet, move terminals a and b to the other end of the circuit. You can do this because a continuous wire path is all the same node, and anything connected to it can be moved to another point on the same conductor.

    attachment.php?attachmentid=73120&stc=1&d=1410636187.gif
     

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