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Who do I know the direction of the current flow, when I make nodal analysis?
#2: The problem occurs when I user Ohm's law, it can end up in the wrong results if the direction I assumed is wrong. Any solution to that?
#2: The problem occurs when I user Ohm's law, it can end up in the wrong results if the direction I assumed is wrong. Any solution to that?
If you do everything consistently then you will never get wrong results, even when you assume a wrong direction. Because of this, I always assume that every current is leaving the node. I know that at least one of those assumptions is wrong, but by being consistent I still come out with the right answer.The problem occurs when I user Ohm's law, it can end up in the wrong results if the direction I assumed is wrong.
At any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node
or equivalently
The algebraic sum of currents in a network of conductors meeting at a point is zero.