This is a great tip sheet for noobs. I'm sooooo glad to see someone distinguishing between a cell and a battery of cells!
Pop quiz: Anyone like to tell me the difference between a potentiometer and a variable resistor? (You may disregard the fact that the variable resistor depicted appears at first glance to have 3 tags.) Don't get smart with me - I know the answer.
Unless he would just fake it...
Well this is what i know. The potentiometer can in fact be used as a variable resistor if you leave out one of the side pins. But in general potentiometers are used for voltage dividing. :)
What else...hmm, the variable resistors have 2 pins and pots have 3!