AS seen
earlier, the charge on capacitor plates depends on the applied voltage. Let 'V'
be the voltage applied to the capacitor and 'Q' be the charge accumulated on
the capacitor plates, then mathematically, it can be written as,

The constant
of proportionality 'C' is called capacitance of the capacitor, defined earlier.

From the above
expression, the capacitance is defined as the ratio of charge acquired to
attain the potential difference between the plates. It is the charge required
per unit potential difference. It is measured in unit farads.

One farad
capacitance is defined as the capacitance of a capacitor which requires a
charge of one coulomb to establish a potential difference of one volt between
its plates.

The
capacitance is symbolically denoted as shown in the Fig 1.

For practical
use, the farad is too large unit and hence, micro farad (µF), nano farad (nF)
and pico farad (Pf) are commonly used.

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