NODAL ANALYSIS: Solving for Voltages in Electric Circuits | Supernode Technique | Dependent Sources 

HE'S BACK

I have watched many of your classes, thank you very much Sir!!..

Hello Prof. [ At 8:29 we said current is leaving node 1 into node 2; and so, we defined it as positive got it. Then at 11:01 we said there is current leaving node 2 into node 1]. We defined both to be positive: leaving their respective node. I originally thought this made sense because we are just letting the math work itself out. For every node, if we don't know, just say it's leaving the node. Got it. But then [at 37:40 we said current is leaving node 1 into node 2. Got it. But at node 2 we said if current is *entering because we just said for our node 1 equation it is leaving. That also makes sense]. So, between these two problems, why did we approach it differently? What if for problem 2 we did what did we problem 1 and just kept it positive instead of intentionally defining it negative like we did in question 1? Would the math just work itself out, or would there be a bigger problem? Thank you.

Thanks for posting this. I always used mesh current analysis because node voltage method was weird to me. Ps you save my a** in machine element design