Capacitance, Physics


If we increase the voltage between the plates, the charge increases, but the ratio of charge to voltage remains the same.  This ratio gives the capacitance (C)  of the capacitor.

                                  Charge/Voltage =  A constant called capacitance

When the charge (Q) is in coulombs and the voltage (V) in volts, then the capacitance (C) is in farads (F).

                                      C =Q/V  (and also Q = VC, V = Q/C)

A capacitor has a capacitance of one Farad when a charging current of one ampere, flowing for one second, causes a change of voltage of one volt between its plates.  The Farad is a huge unit and smaller units are used in practice.

                   1 microfarad (μF)  =  10-6 farad

                   1 picofarad   (pF)  =  10-12 farad


Posted Date: 9/13/2012 4:16:46 AM | Location : United States

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