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There is one thing i can't seem to figure out and it is the sign convention for circuits. On one side my textbook says that it is arbitrary and a neg sign in some cases means that we didnt chose the correct polarity and in some cases i feel like it is some kind of vodoo magic. I don't get how they chose the voltage drop of a resistance while applying node voltage analysis. I understand the node business. However, when it comes to find specific voltages of a resistance i don't get how you choose to +Vr ( resistance voltage) or -Vr. So please if somebody has a clear explanation on how to play this node voltage analysis please do so. I am sorry to seem stupid but i am trying to learn. TX for the help: )