Capacitors: An explanation of their purpose

A capacitor is a device that stores a quantity of electrons. Capacitors are identified by the dielectric (insulating) material used in their manufacture.Two commonly used schematic symbols for a capacitor are shown here. Both symbols are meant to represent the two plates of a capacitor with the insulation between them. The curved plate in the lower symbol indicates that the plate should be connected to a negative polarity.

An excerpt from “Technical Institute Manual 2” from the Refrigeration Service Engineers Society online store.  RSES.ORG

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