Przemek Klosowski writes:

Lets say there is a 100' extension cord (with metal copper conductors)
energized by a live household 120V 60Hz outlet. Nothing is plugged into
the cord, and it's one without any indicator lights or ground fault
gimmicks. Said cord is dry, other than the typical indoor humidity of a
normal household garage.
....
The main loss will be through the AC current driving the cable
capacitance. There's also radiation losses but at 60Hz they are
negligible.

A capacitive load consumes no watts.


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