Electrolytic capacitors

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In an electrolytic capacitor metallic anode coated with an oxidized layer used as a dielectric. These capacitors are polarized. Electrolytic capacitors are categorized based on their dielectric.

Aluminum electrolytic capacitors – aluminum oxide (dielectric).
Tantalum electrolytic capacitors – tantalum pentoxide (dielectric).
Niobium electrolytic capacitors – niobium pentoxide (dielectric).