In theory it will. If an ideal capacitor is charged to a voltage and is disconnected it will hold it's charge. In practice a capacitor has all kinds of non-ideal properties. Capacitors have 'leakage resistors'; you can picture them as a very high ohmic resistor (mega ohm's) parallel to the capacitor.
A capacitor is a device which stores electric charge. Capacitors vary in shape and size, but the basic configuration is two conductors carrying equal but opposite charges (Figure 5.1.1). Capacitors have many important applications in electronics.
If this simple device is connected to a DC voltage source, as shown in Figure 8.2.1 , negative charge will build up on the bottom plate while positive charge builds up on the top plate. This process will continue until the voltage across the capacitor is equal to that of the voltage source.
However you could discharge the capacitor in the time delay circuit before the reservoir capacitor goes below 0.6V. This will completely remove power from the MCU so it should reset properly, and when the battery is reconnected the power on delay will be reapplied.
If the capacitor is connected to the battery, then the voltage stays constant. It stays equal to the battery voltage. The battery is a charge pump. It can pump charge from one plate to the other to maintain a constant potential difference. If the battery is disconnected from the capacitor, the charge on the plates stays constant.
• A capacitor is a device that stores electric charge and potential energy. The capacitance C of a capacitor is the ratio of the charge stored on the capacitor plates to the the potential difference between them: (parallel) This is equal to the amount of energy stored in the capacitor. The E surface. 0 is the electric field without dielectric.