Hello All, I am a ME student but, I'm trying to teach myself EE. I am testing out a stepper motor. Here are the specs for the motor: Rated Voltage: 5.7V Rated Current: 1A per Phase Resistance per Phase: 5.7V I am using 15 VDC and want to make sure I don't blow the motor. Using Ohm's Law, VInput = R * IMotor, I get 15 = 1(I) which gives me a resistance of 15 ohms. My Questions: (1) What is rated voltage? Is that the optimal voltage for the stepper motor? (2) What happens if I go above the rated voltage? (3) If I use a 15 Ohm resistor, will this be enough so the motor doesn't blow? I am clearly missing something here. Any help would be appreciated. Thanks in Advance.