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.
Electricity is know â¦ n to date back to the 6th century BC with a greek names Thales experimented it first by rubbing a fur and discovering that it would attract objects together. In Italy during the period of renaissance, a physicist Girolamo Cardano had discovered magnetism and electrical power.