Understanding how electrons move through and interact with a dielectric material is instrumental in understanding capacitance or gravity. When electrons are more plentiful and active voltage is found to be more negative. The more negative voltage area is going to have electrons emanating from it. These electrons will fly relatively fast and straight. A dielectric material will back-fill the fast electrons with electrons moving in a more erratic manner in the other direction.
There is a lot of space between atoms in a medium. This allows certain electrons to take off statistically according to the Poisson distribution. The electrons that take off will leave a charge imbalance behind. Electrons move with a speed that is a fraction of the speed of light. That is to say electrons move very quickly. Electrons will move in to replace the electron that took off from the more negative region.
Electron movement is more ordered when an electron moves from negative to positive. Less ordered is the movement when moving from positive to negative. Electrons shoot one way and bubble back to fill the charge balance from the electron that blasted away.
This is true in a capacitor. A planet also acts in this way. Not only do electrons bubble back to fill in for escaped charge but positive ions are pulled in as well creating gravity.
Capacitors have electrons jumping from the more negative plate towards the positive plate. Electrons in the dielectric instantly back-fill the escaped electron from the negative plate. Eventually the back-fill electrons have enough kinetic energy to store Joules of capacitive energy.
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