Capacitance measures the amount of stored charge per voltage. When capacitance is high, the quantity of stored charge is also high while little electric potential is used. Its units are referred to as farads. To change the capacitance of plates, the amount of conductive material between them, which is called dielectric, has to decrease. This photograph contains a computer's keyboard, which is a common example of capacitance. When someone presses a key, the distance between the plates of the key changes, a message is sent to the computer, and the symbol appears on the screen. In order for this symbol to stop appearing, the key's capacitance has to return to its initial value.
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