I'm trying to solve a circuit that uses an op amp with a +-4mV offset but I've run into two problems trying to find output offset voltage.
When looking at the solution to the problem, I noticed that the solution had i1 current equal to (VA-Vos)/1Mohm. I don't understand why they made a separate node labeled VA because I had it originally as Vo-Vos/1Mohm. Is it because Vo value changes after going through the resistor so you label the new value VA? Also wanted to know how they label both currents through the resistors i1 because the first one on the left should be I=Vos/1 and the second should be I=VA-Vos/1
why is a voltage source included on the positive terminal when in the original the positive terminal was grounded.