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Help with analyzing a Wheatstone Circuit using Node-Voltage Analysis

  1. Feb 2, 2014 #1
    1. The problem statement, all variables and given/known data
    Calculate the resistance of R3 so that Vab = Va - Vb = 0, assume Rth is 75Ω.

    Here is a picture of the circuit: http://i.imgur.com/zsQBYJx.jpg

    2. Relevant equations



    3. The attempt at a solution
    Never seen this circuit before, don't know where to begin. I assume I have to analyze the voltage at each node and set up a system of equations which can allow me to calculate R3 based off of the values that I already know, but i'm not sure how to begin. Thanks in advance for any hints.
     
  2. jcsd
  3. Feb 2, 2014 #2

    gneill

    User Avatar

    Staff: Mentor

    You need to show some attempt. Why not start by writing the node equations for Va and Vb?
     
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