I've been given a copy of my friend's midterm exam from this same class from last term, and decided to take a crack at it to help study. One question type in particular really messes me up and it looks like the following. How would I go about solving these in the future?
A solid insulating...
Ah. That helps. When it was explained to me, I was told I had to keep the current directions constant, so that's why I have the mix of ins and outs, but knowing I can use just addition or just subtraction is very helpful.
When respecting that direction, I assume I also have to reflect it in my ohm's law formulas? (ex. if I say all currents are flowing into v2, I would have to consider v2 as the "lower potential" and v1, v3 as "higher potential" [v1 - v2/20] and so on?)
When you say to pick one direction, I should respect those defined directions at other nodes they affect (ex. if I say current flows into v1 from v2, I have to say it flows out of v2 in my KCL equation for v2 [subtracting it instead of adding it]), or can I sum all the currents at each node?
There we go. the lighting in my room is terrible and I wasn't sure if a picture would turn out correctly. This one used directions I arbitrarily assigned and calculated from.
I've been assigned the following problem for homework in my Electrical Engineering class:
*Note, the duplicate v2 is supposed to be v3.
But I keep getting
v1 = 4.10V
v2 = 4.81V
v3 = -1.19V
and
i0 = 52.9mA
Every simulator I've put this into says it's wrong, yet I've attempted solving it...