Learn more physics!
I have a small electrical DC motor and I want to know how much RPM does it revolute when I operate it. Knowing the voltage source (16V) and the motor's inner resistance (16 Ohms) is there any way I can calculate the operating RPM with that data? Thanks in advance
No, the only thing you can determine is the amount of current flowing, I = V/R. Although the angular speed of the motor does depend on the voltage, it also depends on several other variables: construction of the windings, friction in the bearings, etc. The best you can do is just to measure the rotational speed with a tachometer.
(published on 04/13/10)
Follow-up on this answer.