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what are the laws for variables in here

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https://i50.tinypic.com/s3iz4j.jpg

in the top circuit they want to find northon/thevenin

and as in the bottom circuit there is no independent sources
so they add a test source to know how much current go threw it

i notices that on the top circuit we have 2 intersection
and they want to find the potential on them (v1 and v2)

but on the bottom circuit we have 3 intersections and we put
two variables instead of three .

why??
in this kind of thing
in what intersections do i need to find there potential
??
why they a KCL only on two of the intersection instead of the three present?
 
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Allobro2

New Member
In the first circuit they must indicate i(delta) on the circuit! and then you will have the third equation, after that it will be easy to continue.
 

mbarazeen

Member
in both cases you have two nodes only with unknown voltages, so maked as V1 & V2. voltages are maked on nodes that are unknown, in the 2nd diagram the said 3rd intersection(node) is having the source voltage.
 
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