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Kirchoff's Law

  1. Nov 10, 2012 #1
    Hello dear Physics Forums community, I need your help! I m an electrical engineering student in second class, and I m stuck with a different kind of problem (probably different to me only, lawl) in the Circuit Analysis.

    I believe this problem will be a stepping stone for the other problems I can't solve yet.
    1. The problem statement, all variables and given/known data

    In the attachment.

    2. Relevant equations

    Guess they are the Voltage law and Current Law.


    3. The attempt at a solution

    I m stuck, can't do a thing, will appreciate the attempts to guide me to solution.

    Thank you!

    Edit, Lol, the problem asks the voltage difference between point a,(the corner on left-top) and point b(the left-bottom corner of the loop in right)
     

    Attached Files:

  2. jcsd
  3. Nov 10, 2012 #2

    gneill

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    Staff: Mentor

    Indicate on your diagram where currents are flowing. Then determine the potential drops across all the components. Do a "KVL walk" from point a to point b.

    Hint: A continuous current requires a complete circuit.
     
  4. Nov 10, 2012 #3
    Hmm, so I guess there's no current flowing through the line in the middle?
     
  5. Nov 10, 2012 #4

    gneill

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    Staff: Mentor

    That happens to be a good guess.
     
  6. Nov 10, 2012 #5
    Nice! And can I simply discard the 5v battery and the 10 ohm resistor when I m doing the KVL walk?
     
  7. Nov 10, 2012 #6

    gneill

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    Staff: Mentor

    Nope. The 5V voltage remains 5V no matter what; it's an ideal supply and cannot change. What's the potential drop across the resistor if the current is zero?
     
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