Just a quick note about electricity. Throughout the history of science
the term "electricity" had a fairly definite meaning. It was the quantity
we now know as "charge" (i.e. a charge of electricity.) Go look in the
current CRC handbook, under the definition of "Charge", and it says
"the quantity of electricity." Here are quotes from Maxwell and J.J.
Thompson: http://www.amasci.com/miscon/maxwell.txt
In AC lines, the electricity sits in one place and vibrates at 60Hz. If
we knowing the drift velocity of a current of electricity, we can
calculate the vibration's width. For the usual range of currents it is
less than a tiny fraction of a millimeter.
It's only in recent decades that quantites of "electricity" have come to
mean "electromagnetic energy." A generator sends out electromagnetic
energy, not electrons. The electric companies will be happy to sell you
many joules of electrical energy. But for every coulomb of "electricity"
they give you, they'll take back an equal quantity within 1/120th of a
second.