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Very very very short question circuit analysis please?

  1. Apr 12, 2013 #1
    I am solving a VERY complicated exercise and I have this part that I dont understand.The image posted is a very big simplification of a part of the exercise.I have to find the potential between A and B.My question : Are the 15 Volt and the 13 Volt in the picture involved in the calculation?
    I know I have to calculate the potential using Kirch.law btw.
     

    Attached Files:

  2. jcsd
  3. Apr 12, 2013 #2

    gneill

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    Staff: Mentor

    Do the lines represent wires only? If so, the 13V and 15V sources have no effect on the KVL sum from A to B.
     
  4. Apr 12, 2013 #3
    The lines represent wires and they have resistances in it.
     
  5. Apr 12, 2013 #4

    CWatters

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    Not if one end is open circuit. Are they really open circuit?
     
  6. Apr 12, 2013 #5

    gneill

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    That's a confusing statement. Are the lines wires, with the resistances represented by the circled potential changes? Or are there hidden potential changes in the lines along the path from A to B?
     
  7. Apr 12, 2013 #6
    Sorry.13 V is also resistance,15 V is only wire.
     
  8. Apr 12, 2013 #7

    gneill

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    How can a wire be 15 V? Do you mean it is a wire that is at a 15 V potential, or leads to a 15 V source? Something like this:

    attachment.php?attachmentid=57802&stc=1&d=1365775770.gif
     

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  9. Apr 12, 2013 #8
    Wire that has a 15 V potential.The image is very right!
     
  10. Apr 12, 2013 #9

    gneill

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    Okay. Then consider that a single node can only be at a single potential; there is no potential difference between any points connected by a contiguous wire. In this case, the blue wires in the figure represent one node. The only potential changes that occur along the path from A to B are those due to the 12 V and 14 V drops.
     
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