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I'm assuming they work by altering the distance of permanent magnets away from the flywheel. I'm pretty sure that's how my panic-bought Elite Zumo does - you can sometimes hear the motor whirring when it changes.
So if you unplug it the motor will stay in the same place and you still have resistance. Maybe there are some that do it eletromagnetically instead.
grams
hippy
Yeah but "magnetic" resistance isn't "electro-magnetic". Most smart trainers except the Neo require external power to generate the magnetic load.