They can be used in charge pump circuits as the energy cache element in the generation of greater voltages than the input voltage. Capacitors are joined in parallel with DC power circuits of most electronic devices to smooth current fluctuations for signal or control circuits.
A capacitor can store electric energy that is connected to its charging circuit. When it is disconnected from it is changing circuit, it can dissipate that stored energy so that it can be used as an interim battery. Capacitors are commonly used in electronic devices to maintain power supply while batteries are being charged.
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