A correlation is a single numerical value that is used to describe the relationship between two variables. All correlations have strength and direction. When two variables have a positive correlation, that means the two variables move in the same direction. The closer a positive correlation is to 1, the stronger it is.
William Gilbert discovered electricity, not Nikola Tesla. Nikola Tesla invented things. not discovered electricity. Again, William Gilbert discovered it and named it. He did this in the 1600s. It wasn't Nikola Tesla.
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.