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Direct Current

Related Terms


A painting process that uses the particle-attracting property of electrostatic charges; direct current of about 100,000 volts is applied to a grid of wires through which the paint is sprayed to charge each particle; the metal objects to be sprayed are connected to the opposite terminal of the high-voltage circuit, so that they attract the particles of paint.


The direct current that passes through the collector of a transistor.


  1. In induction heating, the thickness of a layer, extending inward from a conductor's surface, whose resistance to direct current equals the resistance of the whole conductor to alternating current of a given frequency. 2. The greatest depth in an ultrasonic test piece at which indications can be measured.


An oscillator that uses an avalanche diode as a negative resistance to achieve one-step conversion from direct current to microwave outputs in the gigahertz range.


A bar of semiconductor material, such as germanium, that will oscillate much like a quartz crystal when it is placed in a magnetic field and is carrying direct current that flows parallel to the magnetic field.


A normally non-current-carrying conductor used to connect the non- current-carrying metal parts of a boat and the non-current-carrying parts of the direct current devices on the boat to the boat's common ground point for purposes of reducing hazards of stray-current corrosion, lightning and accumulated static, and to reduce radio noise.


A device that converts the alternating current sine wave produced in all generator armatures into direct current at the dc generator terminals.


A device for changing direct current to alternating current. A device for changing alternating current to direct current is called a CONVERTER if a rotary device and a RECTIFIER if a static device.


The arrangement of direct current arc welding leads in which the work is the negative pole and the electrode as the negative pole of the welding arc.


The law that the direct current flowing in an electric circuit is directly proportional to the voltage applied to the circuit; it is valid for metallic circuits and many circuits component that obeys Ohm's law. OHV engine See overhead-valve engine.

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