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1. Battery is a source of energy for a circuit, whereas capacitor is a passive element, which draws energy from the circuit, store and release it. 2. Usually battery is a DC component, whereas capacitor is mostly used for AC applications. It is used to block DC components in circuits.
Â· just now. Report Abuse. farad---where C is a Coulomb, V is a volt, and N is a Newton. However, a Farad is a huge capacitance, so more usual practical units are the microfarad, nanofarad, and picofarad (puff). daanzig Â· 9 years ago.