Well I am building simulated rotating emergency lights (using rows of LEDs that light up in sequence) thats run by different rotary switch outputs (yes its unorthodox i know) and the switch is turned by a 12VDC motor. I want to be able to change the speed by using a dial. I looked at potentiometers and thought they would be perfect except, I don't know how to use one in a circuit. I don't even know if thats the device i want. So, if you could, just shed some light on my predicament. Thanks!