Cecil Moore wrote:

Plug a 100k resistor into your wall socket.
Assuming the "hot" wire is the one on the left, like it is in my
house, and that hot wire is the reference: When the resistor lead
plugged into the hot side is a positive voltage compared to the other
side, the current is flowing out of the hot wire into the resistor, by
convention. When the resistor lead plugged into the hot side is a negative voltage, the current is flowing into the hot wire.

Right - sort of. But alternating current flows *through* the resistor -
not *to* and/or *from* it. There is no convention describing
unidirectional flow of alternating current. That is what you've been
trying to say, i.e. current into one end of a coil.

73, Jim AC6XG