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GLOSSARY 379
Capacitance: The property exhibited by an electric condenser which permits storage of an electric charge; often called capacity.
Choke : A coil of relatively low resistance to direct current but of high impedance to alternating current. It is used to store electrical energy for very brief periods of time, to cause a surge or piling up of voltage in a circuit, to bring a circuit into tune or resonance, or to provide a path for lowfrequency or direct currents, but not for high-frequency currents.
Circuit: A path in which electric current will flow when potential is applied.
Condenser: Two or more sheets of metal separated by an insulator called the dielectric. A condenser is used to store electrical energy. For brief periods of time to bring circuits into tune or resonance, to level out surges and inequalities in a current.
Control: The electrode of a vacuum tube to which controlling variations are applied; the grid or screen electrode of an audion.
Damped waves: Waves whose intensity, at any given point in space, more or less gradually dies away.
Damping: The dying away of the intensity of a damped wave. If the intensity falls off rapidly the damping is said to be high or large.
Dielectric: The insulating medium separating the plates of a condenser.
Direct Current (Abbr. D. C.) : An electric current flowing continuously in one direction. In a two-wire circuit, for example, direct current always flows from the positive source to the negative return; therefore, direct current always has a readily determinable polarity, while alternating current (A. C), which is constantly reversing its polarity while flowing through a circuit, has no apparent polarity.
Earth connection: The wire leading to water pipe, buried plates, or other conductors used as the ground terminal.