Before the turn of the century, Thomas Edison and Tesla were engaged in a battle known as the War of Currents. Edison was a staunch proponent of direct-current electricity, while Tesla was an advocate of alternating current. Tesla was confident that AC was the way of the future, but Edison had already sunk a great deal of time, energy and money into DC.
The problem was that DC required expensive, high-maintenance converters to transform between voltages. AC, on the other hand, could do the same thing with less expensive and more efficient equipment, making it more effective in overcoming current loss over great distances. Tesla knew this and continued to promote AC for wide distribution. ... Continued