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To charge a capacitor, connect it in a circuit with a power source and a resistor. As it charges, the voltage across the capacitor increases. To discharge it, connect a resistor across the terminals or short-circuit it using a wire. The capacitor discharges and the voltage across it decreases.
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There are different types of capacitor and of course the type of plate and dielectric makes it different from each other. Since the essense of the capacitor is to charge and discharged electric current. It can be charged by energising itit, definitely by connecting it to a power source with each terminal both positive and negative well connected to power supply source. Of course it must be a DC power supply source since capacitor is a passive electronic component. It can only be fed with a DC voltage.

Provided the voltage is not too high or arbitrary for the capacitor, with time there will be a build up voltage in the capacitor and it will charge up with time. Though, the charging depends on the type of capacitor and voltage in.

Also to discharge a capacitor, you will have to connect the capacitor in parallel with a resistor of higher killo ohms which is expected to drain off all the voltage voltage with time.
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Charging a capacitor:

1. Connect one lead of a power source to one lead of the capacitor. 

2. Connect the other lead of the power source to the other lead of the capacitor. 

3. Allow the capacitor to charge for the specified time. 

Discharging a capacitor:

1. Connect one lead of a resistor to one lead of the capacitor. 

2. Connect the other lead of the resistor to the other lead of the capacitor. 

3. Allow the capacitor to discharge until the voltage across the capacitor is equal to 0V.
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The simplest way to charge and discharge a capacitor is to use a battery. When you charge the capacitor, you are pushing a current through the capacitor. The current through the capacitor is high enough to cause the cap tooving from its status of "dead" or "active" and high enough to cause the capacitor to perform its job.
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As it charges, the voltage across the capacitor increases. To discharge it, connect a resistor across the terminals or short-circuit it using a wire. The capacitor discharges and the voltage across it decreases.
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