Difference between 12V & 6V dc gear motor of same rpm?
I would suspect the "6V dc gear motor of same rpm" to use more current then the 12V one..
The quick answer is, the 12VDC gear motor is intended for use with a 12 volt DC supply, and the 6V gear motor is intended for use with a 6 volt DC supply.The quote for rpm, presumably that tells us the speed of the output shaft (in revolutions per minute), likely the no-load (i.e. zero torque) speed, when the gear motor is energized, with 12VDC for one, 6VDC for the other, respectively.By the way, the numbers you have given us, these only tell part of the story. I mean, these numbers do not fully characterize these motors.I tend to think about these things in terms of power.On the electrical side, power is the product of voltage and current.On the mechanical side, power is the product of speed and torque.I guess what I am saying is, when someone, like a motor seller, only tells me some of the numbers, like voltage but not current, or speed but not torque, then I know I am not seeing the whole picture.