Power is drawn from the load, not pushed from the supply.

It occurred to me later that this is incorrect. Power _is_ pushed from
the supply (with a force of approximately 120V). It's how well the load
resists this push that determines how much current it will pass. Open
air resists it very well; copper wire does not.

Voltage is a potential energy, much like (to use a frequent analogy) a
lake at the top of a waterfall. As it falls, the potential is converted
to heat, motion, whatever by the mechanisim through which the current
passes.

Brian
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