Plate tectonics (from the Late Latin tectonicus, from the Greek: ÏÎµÎºÏÎ¿Î½Î¹ÎºÏÏ pertaining to building) is a scientific theory describing the large-scale motion of 7 large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, over the last hundreds of millions of years.
1600s | 1700s | 1800âs. Benjamin Franklin was one of most innovative Americans of all time. In deed, his work and experiments resulted in several important discoveries and inventions including electricity, bifocal glasses, a usable battery and many more. Ben Franklin believed electricity could be harnessed from lightning. In 1752, he devised an experiment to test his theory. Although details of the experiment remain sketchy to this day, Franklin originally wanted to test his theory atop a spire that was to be built on a Philadelphia church.
His correct understanding of the nature of electricity paved the way for the future. 1800 First electric battery invented by Alessandro Volta. The âvoltâ is named in his honor. 1808 Humphry Davy invented the first effective âarc lamp.â The arc lamp was a piece of carbon that glowed when attached to a battery by wires.821 The first electric motor was invented by Michael Faraday. 1826 Georg Ohm defined the relationship between power, voltage, current and resistance in âOhms Law.â. 1831 Using his invention the induction ring, Michael Faraday proved that electricity can be induced (made) by changes in an electromagnetic field.