how much would a little 1.5 v motor poop out on 2 rotations of the shaft going into it? I am thinking of using this as a little generator with little to no movement, bi-directionally for something. help?
The voltage output will depend on the speed of rotation of the input, the faster the input speed the more voltage it will output. However it will also depend on the resistance of whatever the motor is connected to and it's current draw. Also he resistance of the shaft to rotation ( the amount of torque needed to rotate it) will increase as the output current increases. As a rough guide you will never get more voltage out of the motor than is required to spin the motor at that speed, for example; If at 5v the motor spins at 2000rpm then if you were to spin the motor at 2000rpm you would get less than 5v out of it, how much less depends on the type of motor. Moriquendi
(can't see pic cause I'm at work) but if it's DC you likely won't get anything from it. typically A/C motors make for better generators.
i used to spin those little dc motors with my fingers and generate enough voltage to light an led (1.8V) for a second. I would say roughly 1.5-2 V if its spinning constantly at full speed
Not really correct, it depends on the type of motor. Many AC motors have no magnets in (they use coild for both the stator and the rotor) and therefore wont generate anything when spun unless given an excitor current to produce the magnetic field. On the other hand most DC motors (all standard motors as far as I'm aware) use perminant magnets and so don't need an excitor current. Also there are very very few AC motors that run on 1.5v. Moriquendi
