trader_4 wrote:

AC isn't
consistent polarity in the positive/negative sense. It changes. In
the case of the states, roughly 60 times a second.

I don't think it is "roughly". AC powered clocks keep very good time for
long periods. Though I have heard that sometimes the power generating
companies keep track of how many cycles have taken place over some fixed
period of time and slow down or speed up the generators to correct things.

Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.