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Term Description
R.E.A. Rural Electrification Administration
Rad The unit of radiation dose which is absorbed (equal to 100 ergs/gram)
Rated Temperature The maximum temperature at which an electric component can operate for extended periods without loss of its basic properties
Rated Voltage The maximum voltage at which an electric component can operate for extended periods without undue degradation
Reactance The opposition offered to the flow of alternating currents by inductance or capacitance of a component or circuit
Recovered Edge Edge of a flat cable or conductor from which measurements are made
Reference Junction The 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 Loss The part of a signal which is lost due to reflection of power at a line discontinuity
Reflow Soldering The process of connecting two solder-coated conductive surfaces by remelting of the solder to cause fusion
Registration Alignment of one object with relation to another (also called "Register")
Reinforcement A material used to reinforce, strengthen or give dimensional stability to another material
Resin An 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.
Resistance In 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 Cable A cable that returns by its own stored energy from an extended condition to its original contracted form
RFI Abbreviation for Radio Frequency Interference
RG/U Abbreviation for Radio Government, Universal. RG is the military designation for coaxial cable and U stands for "general utility."
Ribbon Cable A flat cable of individually insulated conductors lying parallel and held together by means of adhesive or woven textile yarn
Ridge Marker One or more ridges running laterally along the outer surface of a plastic insulated wire for purposes of identification
Ringing Out The process of locating or identifying specific conductive paths by means of passing current through selected conductors
Rise Time The 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 rms Abbreviation for Root Mean Square
Rockwell Hardness A test for determining hardness in which a hardened steel ball or diamond point is pressed into the material under test
Roentgen The amount of radiation that will produce one electrostatic unit of ion per cubic centimeter volume
RoHS The abbreviation for Restriction of certain Hazardous Substances. It forbids any products entering the EU containing lead (Pb), hexavalent Chromium (Cr +6), cadmium (Cd), other heavy metals, Deca-BDE, PBB and PBDE (chemicals used as flame retardants in compounds). Naturally occurring trace amounts are acceptable.
Rope Lay Conductor A conductor composed of a central core surrounded by one or more layers of helically laid groups of wire
Rope Stand A conductor composed of a center group of twisted strands surrounded by layers of helically laid groups of wire
Round Conductor A conductor whose cross section is substantially circular
Routing The path followed by a cable or conductor
Rulan DuPont's trade name for their flame-retardant polyethylene insulation material
Rupture In the breaking strength or tensile strength tests, the point at which the material physically comes apart (as opposed to elongation, yield strength, etc.)

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