18WuD2x

514 parallel output • parallel-wire line
parallel output A digital output consisting of two
or more lines, all of which carry data at the same
time.
parallel processing In computer operations, the
simultaneous processing of several different programs
through separate channels. Compare
SERIAL PROCESSING.
parallel Q Symbol, Q p . The figure of merit of a parallel
circuit of inductance, capacitance, and resistance.
parallel resistance 1. A resistance connected in
parallel (shunt) with some other component.
2. The resistance between the plates of a capacitor.
3. The resistance across a coil.
parallel resistors Resistors connected in parallel.
If the individual resistances are represented by
R 1 , R 2 , R 3 , . . ., Rn, then total resistance R t is
equal to 1/(1/R 1 + 1/R 2 + 1/R 3 + . . . + 1/R n ). Also
see PARALLEL CIRCUIT.
parallel resonance Resonance in a circuit consisting
of a capacitor, inductor, and alternatingcurrent
source connected in parallel. At the
resonant frequency, the inductive reactance is
equal in magnitude, but opposite in effect, to the
capacitive reactance. The capacitor current and
inductor current are maximum, the line current
is minimum, and the circuit impedance is maximum.
Compare SERIES RESONANCE.
parallel-resonant circuit A resonant circuit in
which the capacitor, inductor, and alternatingcurrent
source are connected in parallel. Compare
SERIES-RESONANT CIRCUIT.
parallel-resonant trap A wavetrap consisting of a
parallel-resonant inductance-capacitance (LC)
circuit. Compare SERIES-RESONANT TRAP.
parallel-resonant trap
parallel-resonant wavetrap See PARALLEL-
RESONANT TRAP.
parallel-rod oscillator An ultra-high-frequency
(UHF) oscillator tuned by means of two straight,
parallel quarter- or half-wave rods, one rod connected
to the base or gate of a transistor, and the
other rod connected to the collector or drain.
parallel-rod tuning Adjustment of the resonant frequency
of a section of open-wire transmission line.
A movable shorting bar allows quarter-wave resonance.
The impedance at resonance is very high.
Input
1 /4 Wavelength
Moveable
shorting bar
parallel-rod tuning
parallel-series Also called series-parallel. Pertaining
to an arrangement of components, usually
similar (e.g., resistances), consisting of parallel
circuits connected in series with each other, or of
series circuits connected in parallel with each
other. Usually, the component values or ratings
are all identical, so currents and/or voltages are
equally shared among them. Also see PARALLEL
CIRCUIT and SERIES CIRCUIT.
parallel-series capacitors Capacitors connected
in PARALLEL-SERIES, usually to obtain higher
voltage and/or current ratings than an individual
capacitor can provide.
parallel-series inductors Inductors connected in
PARALLEL-SERIES and separated or oriented to
minimize the effects of mutual inductance.
parallel-series resistors Resistors connected in
PARALLEL-SERIES, usually to obtain a higher
power rating than an individual resistor can provide.
parallel storage In a computer, storage in which
all information items can be made available in the
same amount of time.
parallel-tee amplifier A bandpass amplifier having
a parallel-tee network in its negative-feedback
path. The null frequency of the network determines
the pass frequency of the amplifier.
parallel-tee measuring circuit A parallel-tee network
used for measuring circuit constants. Also
called TWIN-TEE MEASURING CIRCUIT.
parallel-tee network A resistance-capacitance
(RC) network containing two tee sections (with R
and C elements opposite in the tees) connected in
parallel. The network produces a null at one frequency.
Also called TWIN-T NETWORK.
parallel-tee oscillator A resistance-capacitance
tuned oscillator having a parallel-tee network in
its negative-feedback path. The null frequency of
the network determines the oscillator frequency.
parallel transfer A form of digital information
transfer, consisting of two or more lines that
carry data at the same time.
parallel-wire line A transmission line consisting of
two parallel wires whose separation is kept