H.C. Oersted had discovered the magnetism by current in 1820, and Faraday had proved in 1831 that current flowed by the relative motion of a magnet and a coil.
It was a phenomenon of electromagnetic induction, when the magnet was taken in and out of a coil, current flowed into the coil, and when current was conversely sent through the coil, it discovered that power arose to a magnet.
That is, if magnetic flux is changed, an electric charge can be moved(current is sent) , and it has become a principle of a dynamo or an electric motor by the phenomenon which a magnetic field will occur and will exert power on a magnet if an electric charge moves.
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