Potentiometer/voltage divider?!?? Hey, We've been taking electronics in class and among the things we've taken are "potentiometers", as the teacher calls them... From our labs, all I know is that it's a device that has a slider thing on a rail... and apparently it somehow controls the current or something? It has an input and two other holes which somehow connect to the circuit, like so: It's illustrated in the following circuit diagram as the big box in parallel: Can someone explain exactly how this thing works? (The big picture, I'm not so much interested in the complete details) Also, if it's just a voltage divider, why are there three holes? Why couldn't it just be considered a variable resistor? I hope someone can clear this up for me. Thank you.