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Capacitors are electrical devices manufactured to possess capacitance. Capacitors oppose changes in voltage over time by creating a current. This behavior makes capacitors useful for stabilizing voltage in DC circuits. One way to think of a capacitor in a DC circuit is as a temporary voltage source, always “wanting” to maintain voltage across its terminals at the same value. A typical capacitor is made up of two parallel conductive plates separated by an insulator called a dielectric as shown below:
