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.
Tesla used this high frequency current to develop some of the first neon and fluorescent lights. 1881: The first public electricity supply. The first public electricity supply was generated in Godalming, Surrey using a waterwheel at a nearby mill.1883: Magnus Volks built the first electric railway. The first electric railway opened on Brighton seafront, built by electrical engineer Magnus Volks.881: The first public electricity supply. The first public electricity supply was generated in Godalming, Surrey using a waterwheel at a nearby mill. 1883: Magnus Volks built the first electric railway. The first electric railway opened on Brighton seafront, built by electrical engineer Magnus Volks.