First of all, let’s define what free energy means. It means that the cost of creating energy is much less than produced energy. There are some obvious examples of free energy such as solar and wind energies, and not so obvious ones such as radiant energy and centrifugal force.
Some of those energy generating powers seem to be against all, or at least some, laws of science. Some of them are borderline with an ill-reputed “Perpetuum Mobile”. However, if you think about some major inventions of the past (such as airplane, diesel engine, and nuclear bomb) you will see that at the time those inventions were against scientific knowledge of the moment as well.
Let’s look at some possibilities in free energy which may not be as obvious as solar or wind.
– Ambient heat.
The idea of getting electrical or mechanical energy from the heat is not new. In 1900 Nicolas Tesla invented an engine which used heat from the air to produce mechanical energy and called it “Self-acting engine”. 60 years later, an air turbine was created which ran on the hot air going through it. In the same year Charles Brown was granted an US patent for his heat-to-electricity converter.
– Hydrogen.
Hydrogen is a part of water molecule (H2O) and as a result is highly available. With electrolysis hydrogen can be extracted from water and used as a fuel since when it is burned, it recombines with the oxygen and forms vapor. There are quite a few processes which allow separating hydrogen with little initial use of electricity making it a very efficient fuel for the future.
– Magnetism.
One of the most mysterious and abundant sources of energy, magnetism has attracted attention of humans since the ancient times. Sun and Earth both have their magnetic fields and this energy can be used for human consumption as free energy. Since 19th century discoveries in the field of magnetism (artificial magnetic field by Henry, magnetic induction by Faraday) reshaped our current reality with use of radio, television, computers, etc.
However, more applications for magnetism are yet to come. In the past 50 years inventions were made which seem to challenge the laws of physics known to us at the time. For example, inventors of a Zero point magnetic generator claim that their generator can produce free energy in the amounts larger than needed for the device to run. It means that Zero point magnetic generator is actually a perpetual generator, or a “Perpetuum Mobile” which was long ago dreamed off by inquisitive minds of the humankind.