Article about the Definition of capacitor
The definition of capacitor is a device that stores electrical charge and electrical potential energy. The simple capacitor consists of two-conductor plates or sheets that are placed close together but do not touch each other and are separated by an insulator or a vacuum. Conductors are materials that can conduct electric current such as metals, while insulators are materials that cannot conduct electric current such as plastic.
At first, the two conductors are not electrically charged or electrically neutral. In order for one conductor to be positively charged and the other conductor to be negatively charged, then there must be a transfer of electrons from one conductor to another. The electrons are on the surface of the atom, so they are easy to move. After the electron has moved from one conductor to another, one of the conductors has an excess of electrons (lack of protons)
so that it becomes negatively charged, while the other conductor has an electron deficiency (excess proton) so that it becomes positively charged. A detailed description of the process of charging electric charges on capacitors is reviewed on the topic of storing electrical energy in capacitors.