By applying a voltage to a capacitor and measuring the charge on the plates, the ratio of the charge Q to the voltage V will give the capacitance value of the capacitor and is therefore given as: C = Q/V this equation can also be re-arranged to give the familiar formula for the quantity of charge on the plates as: Q = C x V
Capacitance is defined as being that a capacitor has the capacitance of One Farad when a charge of One Coulomb is stored on the plates by a voltage of One volt. Note that capacitance, C is always positive in value and has no negative units.
Also, because capacitors store the energy of the electrons in the form of an electrical charge on the plates the larger the plates and/or smaller their separation the greater will be the charge that the capacitor holds for any given voltage across its plates. In other words, larger plates, smaller distance, more capacitance.
The capacitance C C of a capacitor is defined as the ratio of the maximum charge Q Q that can be stored in a capacitor to the applied voltage V V across its plates. In other words, capacitance is the largest amount of charge per volt that can be stored on the device: C = Q V (8.2.1) (8.2.1) C = Q V
The SI unit of capacitance is farad (Symbol: F). The unit is named after the Great English Physicist. Michael Faraday. A 1 farad capacitor, when charged with 1 coulomb of electrical charge, has a potential difference of 1 volt between its plates. There are several types of capacitors for different application and function.
The amount of electrical charge that a capacitor can store on its plates is known as its Capacitance value and depends upon three main factors. Surface Area – the surface area, A of the two conductive plates which make up the capacitor, the larger the area the greater the capacitance.
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