Saturday 7 March 2015

basic - Decrease in stored energy after connection of another capacitor


A 3-µF capacitor charged to 100V is connected across an uncharged 6-µF capacitor. So the initial stored energy is: 15mJ and the final: 5mJ. What happen to the 10-mJ of energy?



Answer



It is dissipated in the non-zero resistance of the connecting wires. You can calculate that the dissipation does not depend on the actual resistance, so reducing it does not help.



related: energy in capacitors (there must be more but I can't find them)


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