Very very very short question circuit analysis please?

AI Thread Summary
The discussion revolves around calculating the potential difference between points A and B in a circuit analysis problem using Kirchhoff's law. Participants clarify that the 15 Volt and 13 Volt sources are not involved in the calculation if one end is open circuit. The lines in the diagram are identified as wires that may have resistances, but they do not contribute to potential differences if they connect to a single node. It is emphasized that there is no potential difference along a wire connecting two points at the same potential. The key takeaway is that only the potential changes due to the 12 V and 14 V drops should be considered in the calculation.
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I am solving a VERY complicated exercise and I have this part that I don't 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.
 

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Elaia06 said:
I am solving a VERY complicated exercise and I have this part that I don't 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.

Do the lines represent wires only? If so, the 13V and 15V sources have no effect on the KVL sum from A to B.
 
The lines represent wires and they have resistances in it.
 
Elaia06 said:
Are the 15 Volt and the 13 Volt in the picture involved in the calculation?

Not if one end is open circuit. Are they really open circuit?
 
Elaia06 said:
The lines represent wires and they have resistances in it.

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?
 
Sorry.13 V is also resistance,15 V is only wire.
 
Elaia06 said:
Sorry.13 V is also resistance,15 V is only wire.

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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Wire that has a 15 V potential.The image is very right!
 
Elaia06 said:
Wire that has a 15 V potential.The image is very right!

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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