Alternating current (AC) became the premier form of electrical energy after it overcame objections by Thomas Edison who designed direct current (DC).  Tesla also showcased his invention at the 1893 Chicago World’s Fair where he and Westinghouse won the bid to illuminate the International Exhibition.  Alternating current captivated the public with its efficient lighting and lessened heat. 

AC has an electric current whose direction reverses cyclically rather than staying in a constant direction like DC.  The waveform of AC is also more efficient than the DC.  AC is the form in which electricity is carried to homes and businesses. 

Inventor Bio

Born in Smiljan Lika, Croatia, the son of a Serbian Orthodox clergyman, Tesla attended Joanneum, a polytechnic school in Graz and the University of Prague for two years. He started work in the engineering department of the Austrian telegraph system then became an electrical engineer at an electric power company in Budapest and later at another in Strasbourg. While in technical school, Tesla became convinced that commutators were unnecessary on motors; and while with the power company he built a crude motor which demonstrated the truth of his theory. In 1884, Tesla came to the United States and joined the Edison Machine Works as a dynamo designer.

Telsa obtained more than 100 patents in his lifetime. Despite his 700 inventions Tesla was not wealthy. For many years he worked in his room at the Hotel New Yorker, where he died.