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Electrical noise of uncertain origin which is observed in certain resistances when a direct current is present, and which increases with the square of this current.



Related Terms

OHM'S LAW

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.

REVERSE POLARITY

The arrangement of direct current arc welding leads with the work as the negative pole and the electrode as the positive pole of the welding arc.

STRAIGHT POLARITY

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.

BONDING CONDUCTOR

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.

INVERTER

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.

COUPLING CAPACITOR

A capacitor used to block the flow of direct current while allowing alternating or signal current to pass; widely used for joining two circuits or stages. Also known as blocking capacitor; stopping capacitor.

PENETRATION DEPTH

  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.

SVERDRUP

A unit of measure of oceanic current flow equal to 1 million cubic metres of water per second per square kilometre.

AVALANCHE OSCILLATOR

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.

BREAKDOWN IMPEDANCE

Of a semiconductor, the small-signal impedance at a specified direct current in the breakdown region.

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