I'm having difficulty understanding the topic that is currently being covered in my Linear Circuits course. I have a couple questions due on Monday and was wondering if I could get some help solving them. The problems in question are 3.69 and 3.70 in attachment #2. Attachment #1 is my attempt at problem 3.69 (It uses problem 3.43 in attachment #3). I'm assuming it isnt right since the Vth / Rth isnt equal to the Inorton. So I was wondering if maybe someone could help me spot where I screwed up. With problem 3.70, I'm mostly having trouble understanding the wording, and I think if I can get help with 3.69, I should be able to solve 3.70 without a problem. What I'd like to know is, for 3.70, would I need to calculate the nodal voltage above R1 and then recalculate that voltage when R3 is added into the total load? Also, Rs is not included in the Rth equaivalent, correct?
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