#### atyy

Science Advisor

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**Re: cramming work?**

Yes, there is such a thing as cramming work. No one calls it that, they say the work done in charging a capacitor. In circuit theory, you can calculate it by charging a capacitor by putting it in series with a resistor and battery. You know the formulas for power provided by a battery and the power dissipated by a resistor, so you can find the corresponding energies by integrating those over time. The difference between those two energies should be the energy stored in the capacitor. Cramming work obviously depends on the shape of the capacitor. Once the shape of a capacitor is specified, you can calculate its capacitance. The capacitance contains all the information about shape needed for circuit theory, so once you know the capacitance, there is no need to refer back to the shape.I've never even seen cramming work mentioned … but it seems an essential part of the operation of a capacitor.