- A capacitor in which the dielectric is a layer of a metal oxide deposited through electrolysis. The oxide serving as dielectric is usually one of aluminum or tantalum, and is formed on aluminum or tantalum foil, or on sintered slugs. The aluminum or tantalum metal serves as one of the plates, while the other is a liquid or paste electrolyte which saturates a paper or gauze. electrolytic capacitors provide high volume-to-capacitance ratios, but suffer from high leakage currents.
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