| 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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