A Capacitor

A capacitor is a system of two oppositely charged conductors having charges of equal magnitude and having such shapes and relative position that the field set up by the system is concentrated in a limited region of space. In the case of parallel plate capacitors, the conductors are called plates. The capacitance of the capacitor is the mutual capacitance of its plates. The formula for capacitance of a multiple capacitor differs from that for a parallel plate capacitor.