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Capacitor Aluminum

An electrolytic capacitor ("electrolytic") is a capacitor in which one electrode is made of a metal on which a thin oxide layer forms. This layer acts as the capacitor's dielectric. An electrolyte covers the surface of the oxide layer and also serves as the second electrode. Electrolytics have a capacitance to volume ratio much higher than to ceramic capacitors and film capacitors, but smaller than supercapacitors. They find extensive use in electronic devices. Their large capacitance makes electrolytics particularly suitable for passing or bypassing low-frequency signals and storing large amounts of energy. They may serve as filter and reservoir elements in power supplies, to couple signals between amplifier stages, or to store energy as in a flashlamp. Electrolytics can be made with aluminum, tantalum or niobium as the metal electrode and use various liquid (water based or solvent based) or solid electrolytes.

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