Dynamo Drag: Does Adding a Coil Increase Resistance?

[RagingPineapple]

I was wondering;

Imagine two situations:

1) I rotate an axle with a strong magnet attached within a conductive coil (a dynamo).
2) I rotate an axle with a strong magnet attached without a conductive coil.

Does the presence of a coil (and therefore the generation of current in the coil) add any drag to the rotary mechanism, or is the dynamo simply harnessing a form of energy potential that would have been lost otherwise?

 

[pallidin]

Traditionally, it's called "back EMF"
Conceptually, one can consider the well established fact that the generation of electricity(actually, movement) with a mechanical generator REQUIRES resistance to that generation.
That is, in ALL cases of mechanical electrical generators, there will be an opposing force.
If it were not the case... Free Energy!