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Homework Help: Determine potential difference (circuits)

  1. Mar 20, 2014 #1
    1. The problem statement, all variables and given/known data

    Va - Vb


    2. Relevant equations

    V = IR
    Loop rule
    Node rule

    3. The attempt at a solution

    I'm able to find each I value, as well as the direction of current. I'm not sure what to do after that. I know the answer should be 45V, but everything I've tried doesn't lead to that.
  2. jcsd
  3. Mar 21, 2014 #2


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    Homework Helper

    Choose the zero of the potential at b. Knowing the currents on each resistor, choose a path leading from b to a, find the change of potential across each element. Note that the potential decreases in the direction of flow of a current.

  4. Mar 21, 2014 #3
    45,3846V exactly, that is 590/13V
  5. Mar 21, 2014 #4


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    Homework Helper

    It looks correct. :smile:

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