Lets say we have a generator that consists of permanent magnets rotating about a stator consisting of a set of coils. When there is no electrical load on the generator there is not much torque applied against the rotor thus it spin fast. When we apply an electrical load on the generator the rotor slows down, or the generator must work harder in order to maintain the rpm. My question is, what exactly is going on in the coils to slow down the rotor? When you apply an electrical load resistance will be applied to the coils / circuit, but why does this effect the permanent magnet rotor? Sorry if it is a dumb question.