The principle is the law of electromagnetic induction.
The law of electromagnetic induction is also called Faraday's law of electromagnetic induction. The phenomenon of electromagnetic induction refers to the phenomenon of induced electromotive force due to changes in magnetic flux, such as when part of the conductor. In a closed circuit, current is generated in the conductor, the generated current is called induced current and the generated emf (voltage) is called induced emf.
The direction of the electromotive force in the law of electromagnetic induction can be determined by Lenz's law or the right-hand rule. Contents of the Right Hand Rule: Stretch your right hand flat so that your thumb is perpendicular to all four fingers. The palm of your hand faces the N pole of the magnetic field. The direction of the thumb is consistent with the direction of movement. of the conductor. The direction pointed by the four fingers is the direction of the induced current in the conductor (induced electromotive force). The direction is the same as the direction of the induced current.
Lenz's law states that the magnetic field induced by the current must prevent the original magnetic flux from changing. In short, as the magnetic flux increases, the current generated tends to decrease and as the magnetic flux decreases, the current generated tends to increase. The magnitude of the induced electromotive force is determined by Faraday's law of electromagnetic induction e(t) = -n(dΦ)/(dt). For dynamic situations, E=BLV can also be used to find it.
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The importance of Faraday's law of electromagnetic induction lies in the fact that, on the one hand, based on the principle of electromagnetic induction, people have created generators, making possible mass production and transmission of electrical energy over long distances; on the other hand, electromagnetic induction The phenomenon is widely used in electrical technology, electronic technology and electromagnetic measurement. Human society has since entered the era of electrification.
Baidu Encyclopedia - Law of electromagnetic induction
The principle of this device is the induction of radio waves (the same principle is used in current wireless charging systems). Invisible electromagnetic waves penable the coil to obtain an electromotive force induced by alternating current by electromagnetic induction. This is not a true perpetual motion machine and will not work where there is no electromagnetic wave signal.
Just like ore. radio made when I was a child, the whole electronic device has no power supply, but you can still listen to the radio normally. One of the key components is the magnetic rod wrapped in a coil.
There is also the previous transformer, which has two physically isolated coils, one when the coil is energized the other coil will generate different voltages depending on the different number of turns, which is also based on the principle of electromagnetic induction
This type of static electromagnetic power generation device will fail if placed in a large sealed iron box, because if the searchexternal lis is protected, if there are no induced waves, it will be what we often call electromagnetic pollution. .Dyed to provide initial energy, static magnetic coils cannot generate electricity