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capacity and battery

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What's the difference between a battery and capacity that makes the only the former can be the e.m.f. in a normal electric circuit?

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batteries provide a reasonably constant voltage at whatever level of charge, a capacitor doesn't. a 1.5 volt batter will still proved ~1.4Volts at 1% charge. a capacitor will provide something like 0.05V at the same charge

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