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MANAGERS AND PROJECTIONISTS 1019
A very simple form of electrical condenser, which compares with the rubber band, insofar as concerns simplicity, consists of two metallic plates having a sheet of insulating material between. For example let us assume the metal plates to be two sheets of aluminum one foot square, with a sheet of insulating material between of somewhat greater dimensions, so that the insulating material protrudes, or "sticks out" say one eighth of an inch all the way around. This latter is necessary to prevent the current from jumping across from one plate edge to the other.
We will now connect these plates to the two opposite poles of a storage battery or other source of electrical power. Under this arrangement it may readily be understood that instead of applying pull to the two ends of a rubber band, or pressure to the ends of a coil spring, we have set up a condition of electrical pressure, measured in voltage, the force of which is and must be borne by the insulating material between the plates.
Under this condition the condenser is said to be "charged." The sheet of insulating material is under a state of electrical strain just as truly as would be a coil spring with pressure applied to its ends, or a rubber band with pull applied to its ends. That is simple enough, is it not?
It also is plain that the strain the insulating material is under will be exactly proportional to the voltage applied, exactly as the stretch of the rubber band is proportional to the pull exerted.
When we release our coil spring or rubber band, they snap back to their original state. Similarly if we open a switch, thus breaking the power circuit with which the condenser is connected, and "short" the two plates across