EDIT: I feel I might have placed the emphasis wrongly in my original question so I'll try to revise it here.
In the video cited the demonstrator can be seen spinning a small "hobby" motor with her fingers and lighting an LED. Can anyone suggest what the specifications of that motor might be ? Or an actual motor which I could buy online. (I have tried reading the model number off the screen but no joy ;-). I am also interested in more general information but that's the main thing I would like to know. Thanks
I have tried doing just that with a number of motors and not seen the same effect (tried with LED in both polarities).
A couple of the motors used were ones I had lying around and I've no idea of their specs. Another one was this one the specifications of which can be seen on the 'specifications' tab of this web page.
The description of the motor used in the video and provided by the video maker is "Small hobby motor, 6-12 volts" but I suspect that's an insufficiently detailed description of the motor used to ensure the effect shown is seen.
What are the specifications of a motor that would work as shown ?
Secondarily, what is a useful text which outlines all parameters of such motors and what their effect would be when using the motor as a generator ?