Mornin Rich, heres the answer to your good question
Edison tried to use DC for long distance distribution but the I squared R Power losses (and huge copper cables) were too much to overcome. However, Tesla (I think George Westinghouse was also in the picture) proposed high voltage AC with far lower current and then used transformers to reduce it down to 120 or 240 volt. Tesla won becaue while you can transform AC YOU CANT TRANSFORM DC.
That may be little known among laymen but sparkies are well aware that Edisons DC distribution system was doomed to failure due to power losses and inefficiency and the cost of huge copper wires versus what Tesla proposed i.e. high voltage AC distribution with its low current and ability to use step down transformers.
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