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A polarized capacitor will only allow a voltage drop in one direction, due to the design of the electrolyte. The plus terminal needs to be always more positive than the minus terminal. Any other connection will destroy the capacitor.

Older style can-type capacitors have the case being the common minus terminal. Some terminals are marked only with a red dot. That is the plus terminal. Some are marked with an arrow; in general, that is the minus terminal, but you should read the markings carefully and, if necessary, consult the product specification sheet.

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