This was under the assumption that the transmission line was at the same
voltage as the end-user, because there were no good DC-DC voltage
converters in that day. And a few bazillion amps at 120V needs a really
Basic physics. To run DC at the power levels required, the "wire" would
have to be over 100 feet in diameter IIRC. Look up the Edison vs. Tesla
power arguments for all kinds of information on AC vs. DC.