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Homework Help: Kirchoff's Rule on Circuits

  1. Mar 8, 2008 #1
    [SOLVED] Kirchoff's Rule on Circuits

    1. The problem statement, all variables and given/known data
    http://img296.imageshack.us/img296/7852/question1zu0.th.jpg [Broken]

    What is the potential difference V_{ab} of point a relative to point b?

    I found out earlier that the current in the top branch is 0.8 A

    In the middle is 0.2 A

    and at the bottom is 0.6A

    2. Relevant equations

    So V = IR - IR

    3. The attempt at a solution

    3*(0.8) - 4*(0.2) = 1.6V

    But this isn't working for me...what am I doing wrong?
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Mar 9, 2008 #2
    the direction of 0.2 A current is in opposite direction...
  4. Mar 9, 2008 #3
    oh thanks a lot!
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