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C = Eo * K * L * W / D
where C is the capacitance in Farad?s, Eo is the electrostatic permittivity of vacuum or free space, K is the value of the dielectric or insulator used, and L, W, and D are the length and width of the common surface, and the distance between the plates.
For electronic devices such as radios, the frequency tuning is a combination of capacitance and inductance in the formula:
1/ frequency = wavelength = C * I
In semiconductor [intergrated circuit]? devices these capacitors are made up of metal lines and insulators on a substrate. They will store charges such as a HIGH or a LOW.
see also electricity
An advance capacitor is digital logic gates. it is used for RAM/ROM and is found in your digital TV/Radio?, and PC.