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Homework Help: Kirchoff's laws

  1. May 16, 2007 #1
    1. The problem statement, all variables and given/known data
    http://img87.imageshack.us/img87/5418/kirchoff2nr2.jpg [Broken]

    Now, I dnt have a clue on hw to solve this.
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. May 16, 2007 #2


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    Homework Helper

    Why? What is confusing you?
  4. May 16, 2007 #3
    there are three loops and 2 nodes.

    See when considering one loop, do I have to add all the resistance together.
    So for loop 1 (1v)

    the resistance is 2.5

    so current = 1/2.5=0.4 A

    but im getting the wrong answer
  5. May 16, 2007 #4


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    How did you get 2.5? You must sum the entire loop. The sum of the changes in potential across all the elements in a closed loop must be zero. You only need to consider two loops here, and the one node (which gives you the relation between the three branch currents). The value for I won't be the same in each part of the circuit.
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