Which of the following is not a factor that affects capacitance?

Capacitance is defined by the ability of a capacitor to store electrical charge, and it is fundamentally influenced by several key factors including the size of the plates, the distance between them, and the type of dielectric material used.

The size of the plates directly affects capacitance; larger plates can hold more charge, thus increasing capacitance. Additionally, the distance between the plates plays a crucial role; as the distance increases, capacitance decreases because the electric field strength diminishes with distance. The type of dielectric material also significantly impacts capacitance, as different materials provide different levels of insulation and affect the electric field between the plates.

The voltage rating, however, does not influence the capacitance itself. Instead, it indicates the maximum voltage that can be applied across the capacitor without risk of breakdown. While voltage is important in the operating context of a capacitor, it is not a factor that determines how much charge the capacitor can store for a given physical configuration and dielectric material. Thus, it is accurate to say that the voltage rating does not affect capacitance directly.