Hey I am building a bubble machine for a project and I can only use 6V max for power. I need to be able to control the speed of one of my motors. Should I use a potentiometer? I have one but I can't get it to work. The motors are 1.5V-3V and being powered 2 AA batteries each. I tried wiring a potentiometer in between the batteries and motor but I cant get it to work properly. The potentiometer is a 100k Ohm Linear Taper Potentiometer, 250VDC .25W. I don't really know what I'm doing with so help would be very appreciated.