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__nodal analysis__-one of ways of analysis DC circuit - i couldn't understand the physical roots of this way .

i mean how could i make the voltage of a node equal to zero by make it as a reference point without having any effects on the voltage(electric potential) of the rest nodes .

from algebra view i'm sure 100% that this way is correct but physically i find difficult to say that the potential difference of the branch "ab" is:

[tex]U_{ab}=v_{a}-v_{b}[/tex]

and put for example 'a' as reference point and the [tex]

___{ab}[/tex] become [tex]-v_{b}[/tex] .__

could you explain the answer of this physical problem ! please.

thank you

could you explain the answer of this physical problem ! please.

thank you