Assume ground reference is at bottom node.
So in this circuit diagram, some of the currents are shown their directions with an arrow. As I understand NVM, I need to pick whether currents going into a node are positive or negative and vice versa for going out when writing equations equal to zero. However, how do I know which way the current is flowing when there's no arrow specified?
For example, at node V1, I don't know which direction the current is flowing through the middle 8Ω resistor. I know that with regard to the equation, I write (V1-0)/8Ω for the node V1 equation that's equal to zero. However, since I don't know the direction of the current, how do I know if I'm supposed to make that + or -?
Another thing, how can current flow away from ground? Ground is the lowest potential so how is that possible? I see op amp circuits all the time that show current flowing away from ground. It confuses me.