### History and evolution of electronics

1. In 1791 Luigi Galvani: Professor of anatomy (university of bologna) with the help of series of experiments showed the presence of electricity in animals (specifically frogs).
2. In 1799 Charles coulomb: One famous scientist of the 18th century demonstrated that there existed a force between any two charges, this force could be either attractive force or repulsive force and this force is also influenced by the distance of separation between the two charges.
3. In 1799 Allessandro Volta : An Italian scientist credited with the invention of battery. He was the first to develop a battery know as the voltaic cell that could produce electricity as a result of chemical reaction.
4. In 1820, Hans Christian oersted showed that a magnetic field is associated whenever current flows through a conductor. To demonstrate this effect he connect a copper wire to the terminals of a battery and a switch and placed a magnetic compass near the wire. When the switch was close current started flowing in the wire and a deflection was seen in the compass indicating that current carrying conductor has an associated magnetic field.
5. In 1827 George simon Ohm, a germen physicist derived the relation between the voltage applied (V), the current (I), and the resistance of a circuit. This is the famous and the most basic law Ohm’s law. It is given as V=IR.
6. In 1831 Michael Faraday , a British scientist after the discovery by Oersted that a magnetic field is associated with the conductor carrying current, Faraday through a series of experiments discovered that the vice versa is possible i.e. current can be generated by using time varying magnetic field. This phenomenon was termed as the Electromagnetic induction which is the basic underlying principle of the working of generators.
7. In 1864 James Clerk Maxwell, A British Physicist developed the electromagnetic field equations that today is referred to as Maxwell’s equations. He also formulated an important theory known as the electromagnetic theory of light, which told that electromagnetic waves travel in free space at the speed of light.
8. In 1888 Heinrich Hertz, Based on the predictions of Maxwell’s electromagnetic theory wanted to experimentally verify the theory. He performed various experiments according to what Maxwell’s theory and successfully demonstrated to the world the effect of electromagnetic radiation through space .
9. In 1895 Guglielmo Marconi put together the predictions of Maxwell and the experiments of Hertz to send electromagnetic signals through space and was successful in setting up the first transatlantic wireless communication system.
10. In 1948, William Schockley, John Bardeen and Watter Brattain developed the transistor.
11. Nikola Tesla: One great scientist without whom our today’s world would have been dark. Yes he invented alternating current (Popularly known as AC) and gave light to the world. He also has his name Tesla as the unit of magnetic field added to his credit.