18WuD2x

596 resistance-inductance phase shifter • resistors in series-parallel
resistance-inductance phase shifter A phase
shifter containing only resistors and inductors to
obtain the desired phase shift.
R
L
E R
E L
E L E R
resistance-inductance phase shifter
resistance lamp An incandescent bulb inserted in
series with a circuit to provide a dropping resistance.
Such a lamp is capable of dissipating a
large amount of power, shows very little reactance
at low frequencies, and is inexpensive.
resistance magnetometer A magnetometer whose
operation is based upon the change of electrical
resistance of a material (such as bismuth wire)
placed in the magnetic field under test.
resistance material A substance, such as carbon
or German silver, whose resistivity is high
enough to enable its use as a lumped resistor.
See, for example, RESISTANCE ALLOYS and RE-
SISTANCE METAL.
resistance metal A metal, such as iron, whose resistivity
is high enough to enable its use as a
lumped resistor. Also see RESISTANCE ALLOYS.
resistance pad An attenuator composed of noninductive
resistors.
resistance standard A highly accurate and stable
resistor used in precision measurements of resistance.
Also see PRIMARY STANDARD and SEC-
ONDARY STANDARD.
resistance strain gauge An electrical strain gauge
in which the stressed element is a thin resistance
wire.
resistance strip A strip of metallic or nonmetallic
resistance material. Also see RESISTANCE AL-
LOYS and RESISTANCE METAL.
resistance temperature detector A transducer
consisting of a specially made resistor whose resistance
varies linearly with temperature.
resistance thermometer An electronic thermometer
whose operation is based on the change of resistance
of a wire as it is heated or cooled.
resistance transducer See RESISTIVE TRANS-
DUCER.
resistance tuning See VARIABLE-RESISTANCE
TUNING.
resistance welding An electrical or electronic
welding process in which the workpieces are
heated by current flowing through the inherent
resistance of their junction.
resistance wire Wire made of a metal or alloy that
exhibits significant resistivity. See, for example,
RESISTANCE ALLOYS and RESISTANCE METAL.
resistance-wire sensor A specific length of resistance
wire, properly mounted, whose resistance
is proportional to a sensed phenomenon (such as
strain, temperature, presence of gas, pressure,
etc.). See, for example, ELECTRICAL STRAIN
GAUGE, GAS DETECTOR, and PRESSURE
TRANSDUCER.
resistive current The component of alternating
current that is in phase with voltage. Also called
WATT CURRENT. Compare REACTIVE CURRENT.
resistive cutoff frequency Symbol, f rco . The frequency
beyond which a tunnel diode ceases to exhibit
negative resistance.
resistive load A load device that is essentially a
pure resistance.
resistive losses Losses resulting from the resistance
of a circuit or device, and usually appearing
as heat.
resistive transducer A transducer in which the
sensed phenomenon causes a change in resistance,
which in turn produces a corresponding
change in output current or voltage. Compare
CAPACITIVE TRANSDUCER, CRYSTAL TRANS-
DUCER, INDUCTIVE TRANSDUCER, MAGNETIC
TRANSDUCER, and PHOTOELECTRIC TRANS-
DUCER.
resistive trimmer See TRIMMER RESISTOR.
resistive voltage The voltage across the resistance
component in a circuit. In an alternating-current
circuit, the resistive voltage is in phase with the
current.
resistivity Symbol, r. Resistance per unit volume
or per unit area. It can be expressed in terms of
ohms per cubic meter or ohms per square meter.
Also see MICROHM-CENTIMETER and OHM-
CENTIMETER.
resistor A device having resistance concentrated in
lumped form. Also see RESISTANCE and RESIS-
TIVITY.
resistor-capacitor-transistor logic Abbreviation,
RCTL. A form of RESISTOR-TRANSISTOR LOGIC
in which capacitors are used to enhance switching
speed.
resistor color code See COLOR CODE.
resistor core A form around which a resistance
wire can be wound for the purpose of constructing
a high-power resistor.
resistor decade See DECADE RESISTOR.
resistor diode A usually forward-biased semiconductor
diode that acts as a VOLTAGE-DEPEN-
DENT RESISTOR.
resistor FET See ELECTRONIC RESISTOR.
resistor fuse See FUSIBLE RESISTOR.
resistors in parallel See PARALLEL RESISTORS.
resistors in parallel-series See PARALLEL-
SERIES RESISTORS.
resistors in series See SERIES RESISTORS.
resistors in series-parallel See SERIES-
PARALLEL RESISTORS.