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Homework Help: Porential across current source

  1. Nov 1, 2008 #1
    1. The problem statement, all variables and given/known data
    Title says it all. Question is attached.

    2. Relevant equations

    Simple KCLs, KVLs etc

    3. The attempt at a solution

    What I don't get is that isn't [tex]I_{R_{4}} = \frac{R_{3}}{R_{3}+R_{4}} * I1[/tex]

    Attached Files:

  2. jcsd
  3. Nov 1, 2008 #2


    User Avatar

    This expression is for a current divider. It would be valid if R3 and R4 were in parallel, wich they are not.
    Write Kirchoff's equations for the 3 loops to obtain the voltages on the terminals of R4 and R2. The voltage on the source is the difference between them.
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