Free energy mathematical proof using established scientific laws
(engineering.stackexchange.com)
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I would like to see a way how to wind 150m of wire into gap between magnets so, that current will travel through winding in only one direction. :)
Well, jokes apart, problem is that current in a wire is just moving charges (direction X in dude's story), In magnetic field (direction Z) a force on moving charge will appear (direction Y), perpendicular to the charge movement and magnetic field, and since charges are confined in a wire, it will began to move in direction Y. But, at the same time, it means that those charges in wire, moving through magnetic field in direction Y, will also experience same force, but in direction -X that will create a resistance to the current that created this movement. So, from his 4VDC he will not be able to drive 0.5A current when wire began to move. To keep current at 0.5A in wire, accelerating in magnetic field, he will have to continuously rise voltage, so power consumption will be much higher than he suppose. Or wire just will not accelerate at the rate he think due to current drop. Back EMF and all that stuff.
Electromagnetics is funny. It always work both ways, and most interesting thing that it do it simultaneously. :)
That's a good way to describe why motors have power factors and cannot be 100% efficient. It's also why you can't run a generator to power a motor to run the same generator. I can't tell you how many times, as a master electrician, I've had to shut that idea down.