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Yeah but "magnetic" resistance isn't "electro-magnetic". Most smart trainers except the Neo require external power to generate the magnetic load.
hippy-
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
I'd expect fluid and magnetic resistance units to stay at the same resistance setting when you disconnect power, so you ought to be able to continue using them as a dumb trainer.
I doubt manufacturers encourage using them like this though.