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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 or safety hazard.
Reactance. The opposition offered to
the flow of alternating current by inductance or capacitance
of a component or circuit.
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 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.
RFI. Abbreviation for Radio Frequency
Interference.
RHH. Rubber-Insulated, heat resistant
building wire. 90C.
RHW. Rubber-insulated building wire,
heat and moisture-resistant. 75C dry or wet.
Ribbon Cable. A flat cable of individually
insulated conductors lying parallel and held together
by means of adhesive or woven textile yarn.
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 characteristics 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.
Rope Lay Conductor. A conductor composed
of a central core surrounded by one or more layers of
helically laid groups of wire.
Rope Strand. A conductor composed of
a center group of twisted strands surrounded by layers
of twisted strands.
Round Conductor. A conductor whose cross
section is substantially circular.
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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