Again this stupid question. I've learned that I can work with volts, amps = and resistance pretty well without really understanding. I have the water = analogy but that's not the best. So I thought I would make my own analogy,= and ask if it is correct. I am running at 10 km/h through the air. It takes my muscles so much energ= y to keep me running at that speed. If I switch to running through water, f= or example, in order to run 10 km/h I need to be stronger. If I am running = through oatmeal I need to be stronger still to keep my speed at 10 km/h. So 10 km/h equals voltage, amps is how strong I am, and what I am running t= hrough is resistance. If the resistance is more than I am strong then my sp= eed will decrease and I will only be able to run 5 km/h. I can now see how all of those three pieces, V, I and R, balance out. Is this a good analogy? Thanks! Lindy --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .