Electric Generator Symbols - Electrical Symbols Electric Generator Symbols The electric generators (power supplies) are devices that are used to transform any type of energy (mechanical, chemical, solar..) into electrical energy. Generator : A general term denoting any signal source. Electronic Circuit Symbols - Components and Schematic Circuit Symbol. Capacitor is a device that is used to store electrical energy. It consists of two metals plates that are separated by a dielectric. It is applicable as a filter, that is, to block DC signals and allow AC signals. Abbreviated with the letter ‘C’.