Capacitors
A capacitor stores electrical energy when charged by a DC source. It can pass alternating currents (AC), but blocks direct currents, called transient currents.
Capacitors, How are they made?
There are many different types of capacitors used in electronic. Each type is made from different materials and with different methods. Capacitors are also made to handle different amounts of electrical pressure or voltage. Each capacitor is marked to show the maximum voltage that it can withstand without breaking down.
The metal foil capacitor
Perhaps the most common form of capacitor is constructed by tightly winding two foil metal plates that are separated by sheets of paper or plastic. By picking the correct insulating material the value of capacitance can be increased greatly.
Dielectric constant, What is it?
The Dielectric in a capacitor is the material that can withstand electrical pressure without appreciable conduction. When a voltage is applied to a capacitor, energy in the form of an electric charge is held y the dielectric. In the rubber would stretch out and hold the water back. The energy was stored in the rubber.