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Branch Rule problem

  1. Nov 2, 2006 #1
    How do you do this problem? I've seen other branch problems where you just give + sign for current entering and - leaving and the unknown is gonna make it equal 0, but what do you do in this case?

    http://focusedwolf.googlepages.com/branch.jpg
     
    Last edited: Nov 2, 2006
  2. jcsd
  3. Nov 2, 2006 #2

    OlderDan

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    Are there arrows to go with all the numbers? I think you need directions on all of them.
     
  4. Nov 2, 2006 #3
    no, infact thats a scan of a practice/old exam question...nothing like it in my physics book or homework :rofl:
     
  5. Nov 3, 2006 #4

    OlderDan

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    I did not check the multiple choice answers. I suppose it is possible only one of them is a possible solution using all the different possible current directions. I think the maximum possible current would be with all inward currents (except the ammeter)

    I = [10 + 4 + 4 + 5 + 8 - 3] = 28 A

    and that is too much (28*60) = 1680

    Any of the blue numbers could have the opposite sign. Changing the 4 to -4 gives 1200. I did not try the other possibilies.
     
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