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Glossary/Dictionary

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Term Description
R.E.A.Rural Electrification Administration
RadThe unit of radiation dose which is absorbed, equal to 100 ergs/gram
Rated TemperatureThe maximum temperature at which an electric component can operate for extended periods without loss of its basic properties
Rated VoltageThe maximum voltage at which an electric component can operate for extended periods without undue degradation
ReactanceThe opposition offered to the flow of alternating current by inductance or capacitance of a component or circuit
Recovered EdgeEdge of a flat cable or conductor from which measurements are made
Reference JunctionThe junction of a thermocouple which is at a known reference temperature. Also known as the "cold" junction. It is usually located at the emf measuring device
Reflection LossThe part of a signal which is lost due to reflection of power at a line discontinuity
Reflow SolderingThe process of connecting two solder-coated conductive surfaces by remelting of the solder to cause fusion
RegistrationAlignment of one object with relation to another. Also called Register.
ReinforcementA material used to reinforce, strengthen or give dimensional stability to another material
ResinAn organic substance of natural or synthetic origin characterized by being polymeric in structure and predominantly amorphous. Most resins, though not all, are of high molecular weight and consist of long chain or network molecular structure.
ResistanceIn DC circuits, the opposition a material offers to current, measured in ohms. In AC circuits, resistance is the real component of impedance, and may be higher than the value measured at DC.
Retractile CableA cable that returns by its own stored energy from an extended condition to its original contracted form
RFIAbbreviation for Radio Frequency Interference
RG/UAbbreviation for Radio Government, Universal, RG is the military designation for coaxial cable and U stands for "general utility."
Ribbon CableA flat cable of individually insulated conductors lying parallel and held together by means of adhesive or woven textile yarn
Ridge MarkerOne or more ridges running laterally along the outer surface of a plastic insulated wire for purposes of identification
Ringing OutThe process of locating or identifying specific conductive paths by means of passing current through selected conductors
Rise TimeThe time required for the initially zero potential existing on a transmission line (which is terminated in its characteristic impedance) to change from 10% to 90% of its full DC value after a DC potential source is instantaneously applied
RMS or rmsAbbreviation for Root Mean Square
Rockwell HardnessA test for determining hardness in which a hardened steel ball or diamond point is pressed into the material under test
RoentgenThe amount of radiation that will produce one electrostatic unit of ion per cubic centimeter volume
Rope Lay ConductorA conductor composed of a central core surrounded by one or more layers of helically laid groups of wire
Rope StandA conductor composed of a center group of twisted strands surrounded by layers of helically laid groups of wire
Round ConductorA conductor whose cross section is substantially circular
RoutingThe path followed by a cable or conductor
RulanDuPont's trade name for their flame-retardant polyethylene insulation material
RuptureIn the breaking strength or tensile strength tests the point at which the material physically comes apart, as opposed to elongation, yield strength, etc.