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If a source of voltage is suddenly applied to an uncharged capacitor we can see that a sudden (exponential) increase of voltage across the capacitor until the capacitor's voltage equals that of the source; the capacitor will draw current from that source; absorbing energy from it. Once the capacitor voltage reached this final (charged) state, its current decays to zero. If a load resistance is connected across the charged capacitor, the capacitor will supply current to the load, until it has released all its stored energy and its voltage decays to zero. Once the capacitor voltage reaches this final (discharged) state, its current decays to zero. In their ability to be provide voltage (or current), capacitors is acting like a battery for low energy requiring circuits.