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Two identical capacitors connected in parallel what will be enrgy

If a fully charged capacitor connected in parallel with zero charged capacitor then what will be the energy before and after connection?


two capacitors are identical with same ratings.

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Theoritcally, the energy (in Joules) will be exactly the same as all you are doing is effectively doubling the capacitance.
In practical terms, the energy will be very slightly less after connecting them as the charge on the charged capacitor has to be equally distrbuted across itself and the uncharged one, by the flow of electrons via the electrical connection between them. This connection will have a finite resistance (allbeit very low if the connection is not very long), therefore some energy will be dispersed as heat as a result of electrons flowing through this resistance (Amps squared times the resistance times the time it takes for the charge to equally distribute - Joules heating effect & Ohms law).

Posted on Apr 27, 2010

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