Electrolytic capacitors are made using a chemical feature of some metals, earlier called "valve metals", on which an oxide insulating layer can be formed by anodisation to serve as a dielectric.
Electrolytic capacitors are made using a chemical feature of some metals. Some metals are earlier called "valve metals". An oxide insulating layer can be formed by anodisation. This was to serve as a dielectric on some metals, earlier called "valve metals".