The capacitor appears to have the effect of passing alternating current (AC), which actually not passing anything. At the same time, it blocks the flow of direct current (DC).In its most basic form, a capacitor is made up of 2 plates of conducting material (for instance copper, aluminum, iron), divided by a piece of insulative material (for instance mica, air, or plastic). If we apply an electric potential to the two plate electricity will want to attract and flow from one plate to the other, but the insulator will act as the membrane, and block the flow of electricity. For this reason, a capacitor blocks the flow of DC. As power is applied, a certain number of electrons on one plate will leave it with a deficiency of electrons, and the plate will be positively charged.
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