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As discussed in my answer to a strongly-related question - Can permanent magnets be exploited to create energy? - there have been so many attempts to create perpetual motion machines like this one, that Adjunct Engineering professor, Dr. Kevin Kilty, has written an essay that provides categories and explains how they inevitably fail to be true Perpetual ...


6

It really depends upon how you define things, as the other answers have noted, perpetual motion machines violate the laws of thermodynamics, specifically the first and sometimes the second. However, if we remove systems that extract more energy from a system than is put in, we are still left with systems that are able to extract energy to produce useful work....


5

Yes, at least according to: T. Altmann, Y. Carmel, R. Guetta, D. Zaslavsky, Y. Doytsher, Assessment of an ‘‘Energy Tower’’ potential in Australia using a mathematical model and GIS", Solar Energy 78 (2005) 799–808. (www) Abstract: ‘‘Energy Tower’’ is a technology for producing renewable and clean electricity by means of cooling hot and dry air, which ...


3

"Unlimited" and "free" are two absolutes that, in this case, mean infinite energy with 0 cost. Obviously this is not possible according to present human knowledge. However, as correctly mentioned by Keith Thompson, solar power is a good approximation of "unlimited free energy". If proven true, the E-Cat technology, (claimed to be) based on a low energy ...


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