[BC] Happy birthday and thanks for the electricity Nikola

[Dana Puopolo]

DC is still used on many high tension lines because the energy potential for a
volt of power is much higher with DC-those areas outside the sine wave.

-D

From: Jerry Mathis <thebeaver32 at gmail.com>

Edison's public electricity system, based on D-C, was rather quickly
replaced with Westinghouse's polyphase A-C system. Pockets of Edison's D-C
system still exist today, although I really wonder why. Too expensive to
modernize those old elevators?