
Nikola Tesla demonstrated alternating current at the 1893 Chicago World's Fair by lighting 200,000 incandescent bulbs from a single Westinghouse generator, undercutting Edison's DC bid by roughly half and effectively deciding which current would carry electricity into every home on the planet for the next 130 years.
On May 1, 1893, Westinghouse and Tesla lit 200,000 bulbs across the Chicago World's Fair with a single AC generating plant, winning the bid against Edison's DC by roughly half the price and settling the standard that still powers every wall socket in the world.












