Perhaps the first electric motors were simple electrostatic devices created by the Scottish monk Andrew Gordon in the 1740s.2 The theoretical principle behind production of mechanical force by the interactions of an electric current and a magnetic field, Amp?re's force law, was discovered later by André-Marie Amp?re in 1820.
The conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the British scientist Michael Faraday in 1821.
A free-hanging wire was dipped into a pool of mercury, on which a permanent magnet (PM) was placed.When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a close circular magnetic field around the wire.3 This motor is often demonstrated in physics experiments, brine substituting for toxic mercury. Though Barlow's wheel was an early refinement to this Faraday demonstration, these and similar homopolar motors were to remain unsuited to practical application until late in the century. Jedlik's "electromagnetic self-rotor", 1827 (Museum of Applied Arts, Budapest).
After Jedlik solved the technical problems of the continuous rotation with the invention of the commutator, he called his early devices "electromagnetic self-rotors".Although they were used only for instructional purposes, in 1828 Jedlik demonstrated the first device to contain the three main components of practical DC motors: the stator, rotor and commutator.
The device employed no permanent magnets, as the magnetic fields of both the stationary and revolving components were produced solely by the currents flowing through their windingsŹródło: https://en.wikipedia.org/wiki/Electric_motor
This is due to the fact that the instructor and student are in different vehicles, usually a motorcyclist driving instructor in the car.Issuing commands and paying attention to mistakes so it can reach out to the student with some delay and it is the source of many problems.
Although for many motorcycles is a passion for life, many a rider is forced in the future to replace your equipment, for example, disputes family car.
Women sometimes have the interest, though certainly more women have other, more feminine hobby..