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 was not invented by any one person, but its modern day  use is the result of the work of inventors, scientists, and  researchers, who toiled over the subject for â¦ millions of years. The  inventor though was Nikola Tesla Famous for his invention above and  the tesla coil, radio, and Tesla generator.