I would caution all who read TEO_AUDIO's response's to not take the confusing hyperbole too seriously. When a convoluted lecture starts out equating "Delta" to "Rate of Change" (that's like equating distance to speed) you should be justifiably skeptical of the validity of the rest.
The Big Misconception About Electricity
This vid goes quite a ways down the road to explaining why:
1) Power cords make a not so subtle difference.
2) Cable elevators should not be looked at askance.
Regards, barts