This is not always accurate all that simply.
Many, many systems have inherent energy already present in them.
For example;
Taking uranium, a naturally occuring metal, and piling it in a pile, generates "free" heat and energy.
There is nothing in thermodynamics that contradicts this -
it is not "free" energy, but rather the energy has once upon a time been tied into the metal, and as the metal transform through radioactive decay, it releases energy. The second law of thermodynamics following your reasoning says the uranium cannot generate "free" heat and energy - yet it obviously does.
In a similar way, dead dinosaurs, in the form of carbohydrates, can be compressed (or burned) to easily release energy that we dont "put into" the system.
The energy is not free - it was "stored" into the system once upon a time.
In a similar vein-
Vegetable matter (Trees), through combustion, will readily release energy.
So will photovoltaics-
the energy is neither perpetual motion nor free from a physics standpoint. The energy in photovoltaics is generated by a large natural fusion process in the sun, and we simply capture a part of it.
AFAIK-
It is theoretically possible that some process may "release" energy stored in another medium- be it some form of matter /energy state release such as radioactive decay, fission, fusion or some other process. The fact that we dont know of any other practical process today does not mean it is impossible.
Stating that you cannot get more energy out of a process than you put in is to say that neither nuclear fission nor fusion are possible - unlikely imho.
I dont think any form of rotating magnets or antennae are likely to yield such a process ... but that is quite another matter entirely.
For example, physics says that tall antennas penetrating the atmosphere, would generate energy from the solar wind.
We just cannot put up antennas 36.000 km tall, today.
Basically because there is no material strong enough.
Nevertheless the energy is there, and could be harnessed, if done on a large enough scale. Just like PV cells capturing part of the suns energy.
In a similar veing, geothermal taps, mechanisms utilising the tectonic movements etc are all theoretically viable.
Our materials tech is just not up to it, yet.
IMHO antennas etc on the earths surface are not likely to yield anything, because the magnetic fields are just too weak. We have a large body of know-how in electric motors and related tech, and thus know fairly well what force, power, torque and magnetic field strength relationships are.
The second law of thermodynamics, in all it permutations, basically states you can never get more out of a system than you put into it. If you did, you'd be violating the first law of thermodynamics by creating energy. Your rotoverter, in order to give you "usable" energy, would have to put out more energy than you put into it. That can't be done, even if you do believe in magic. There is no such thing as an "over-unity generator" because it violates the second law of thermodynamics.
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-- -hanermo
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