470UF 450V Electrolytic Capacitor

An electrolytic capacitor (occasionally abbreviated e-cap) is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor.

capacitor can also act as an AC resistor. Especially aluminum electrolytic capacitors and are used in many applications as a decoupling capacitors to filter or bypass undesired biased AC frequencies to the ground or for capacitive coupling of audio AC signals. Then the dielectric is used only for blocking DC.