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>> Capacitors are devices that provide electrical energy storage of two types.

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One, where there's two conducting surfaces with an insulator between so that one side,

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when you apply a voltage to it,

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it can't get through the insulator,

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so it piles up as charge at every little atom on both sides,

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one plus and one minus, and stores energy.

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Polypropylene, when it's built in a manner where it's stretched in two sides,

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it comes out as a film, and then you stretch it both lengthwise and

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sideways to orient all the molecules in the direction of the surface of the film.

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Roll up the film and send it into the winding machines, so it wind

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it into with the aluminum foil we are making to make the capacitors.

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The other one was stored energy with the similar thing except that

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the insulator level is the metal oxide.

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The insulating film is deposited by anodizing aluminum,

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and you get very high capacitor levels with electrolytic capacitors.

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So, both tantalum oxide and aluminum oxide are

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very good preventers from electrons escaping their surfaces.

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That's what a capacitor is.

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It's a storage of electric charge.