Hello ,
I'm trying to make a good summary for my exam in electric circuits and I noticed some "shortcuts" in calculating resistance. I added some common applications and some extra in which I need help to simplify. I have googled about it and I didn't find anything and any attempt of me trying to solve it ended up in an endless recursive loop in OHM's law.

Thank you very much!

 

I don't understand your question or your drawings. Pick one case you're stuck on and show us the math you are looking at to solve that case.