Other than a few tunneling electrons (Heisenberg's uncertainty principle) There is not one electron flowing out of a capacitor that flowed into it when charged. It is just not optional, The electrons that leave on the positive side when charging electrons into the negative side do flow out. (as indicated in posts below!) The electrons that vaporized my wires in the story were rushing back into Holes, not passing through the dielectric.
Capacitor start electric motors use capacitors to cause phase lag in the field windings. this lag causes dramatic torque to be generated, and dramatic amps to be drawn. The energy is given back to the windings without going "through" the cap, It is discharged into the circuit where the normal 60Hz voltage would be going back to Zero. This cannot be sustained as it would burn out the windings, but it creates high torque. A governor then snaps the capacitors out of the system allowing normal ac operation. Run capacitors are also used to cause tailored phase change in motors (especially high output heavy duty (well cooled) motors. Again the caps do not pass current through them ever. If any mass of electrons pass ---through--- a capacitor it is broken. Jim
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