# DC can be stored in batteries, while we cannot store AC [closed]

i have heard that direct current can be stored in batteries, but we can not store alternating current. is it true? if yes, then why?

## closed as unclear what you're asking by user36790, ACuriousMind♦, gigacyan, Hritik Narayan, CuriousOneJun 7 '16 at 8:00

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• Nothing stops you from creating AC from DC with a fairly simple electronic circuit. Technically batteries are also not storing "DC" but chemical energy. – CuriousOne Jun 6 '16 at 8:18
• We can also 'store AC', to the extent that makes sense, for instance in a flywheel or in a pumped-storage system which drives AC generators. – tfb Jun 6 '16 at 8:53
• It's not clear what you mean by "store AC" in constrast to "store DC". What about the chemical energy in a battery is "DC"? – ACuriousMind Jun 6 '16 at 10:15
• You don't store current. You store a potential energy difference. When the energy is released, this might make electrons move, which would be a current. – Steeven Jun 6 '16 at 14:00
• You can convert DC to AC using oscillators. – philip_0008 Jun 6 '16 at 14:05

A battery is conceptually very similar to a water pump. A pump creates a pressure difference between its two ends so water flows in an external circuit from the high pressure end, through the circuit and back to the low pressure end. A battery creates a difference in the electrical pressure$^1$ between its two end so electrons will flow out of the anode, though an external circuit and back into the cathode.
$^1$ electrical pressure isn't a concept physicists would normally use since we would talk about the electron potential energy. However it is an equivalent concept. Electrons in a metal behave in a surprisingly similar way to a gas.