Oh good, I’m glad it wasn’t just me. It’s pretty obvious once you’ve been told, from Ohm’s Law (V=IR for anyone who knows even less than me about electronics.) The Voltage is usually constant across a piece of the circuit, so if the resistance goes up, the current (I) goes down. I knew that. What I didn’t know was the practical reason for that - you put a big resistor in the protect the components that follow it from burning out. ‘If in doubt, put in a big one and make it smaller later’. I guess this quickly becomes obvious if you learn electronics the practical way.
It didn’t when I jumped straight from simple bulb circuits at school to the internals of operational amplifiers and P-N junctions in my physics half-degree. I was always blindly following instructions and equations without any of the #feels for why. I’ve come across teachers confused between explaining the ‘what’, ‘why’ and ‘how’ quite a bit recently, sometimes saying they are going to do one but doing another.