18WuD2x

output current • output transformer 505
output current 1. Symbol, I o . The current delivered
by a source, such as a battery, generator, or
amplifier. Compare INPUT CURRENT, 1. 2. Symbol,
I o . Current flowing in the output leg or electrode
of a circuit or device. Compare INPUT
CURRENT, 2.
output device 1. A load device, such as a resistor,
loudspeaker, lamp, relay, motor, etc., that utilizes
the output energy delivered by a generator,
amplifier, or network. 2. A device, such as an output
transformer, that serves to transfer energy or
information from a circuit or device. Compare IN-
PUT DEVICE. 3. In computer operations, a device
that presents the results of computer operation
in a comprehensible form. Examples: printer,
monitor, disk drive, tape drive, modem, etc.
output efficiency The efficiency of a device, such
as a generator or amplifier, in delivering an output
signal. For an amplifier, the efficiency (Eff % ) is
given as a percentage by the formula Eff % =
100P o /P i , where P i is the direct-current power input,
and P o is the alternating-current (signal)
power output.
output equipment See OUTPUT DEVICE, 3.
output filter The direct-current filter of a power
supply operating from alternating current. Also
see CAPACITOR-INPUT FILTER and CHOKE-
INPUT FILTER.
output gap A device via which current or power is
intercepted from an electron beam in a beampower
tube.
output impedance Symbol, Z o . The impedance
“looking” into the output terminals of an amplifier,
generator, or network. Compare INPUT
IMPEDANCE.
output indicator A device, such as an analog meter,
digital meter, or bar-graph meter, that provides
a visual indication of the output-signal
amplitude of an equipment.
output leakage current In an open-collector integrated
circuit, the current from collector to emitter
with the output in the “off” condition and a
certain specified voltage applied to the device. It
can be expressed in milliamperes or microamperes.
output limiting A process for automatically maintaining
the amplitude of the signal delivered by a
generator or amplifier. See, for example, AUTO-
MATIC GAIN CONTROL, AUTOMATIC MODULA-
TION CONTROL, VOLUME COMPRESSION, and
VOLUME LIMITER.
output load See OUTPUT DEVICE, 1.
output load current 1. The current through the
output load of an amplifier. Generally, this current
is expressed in root-mean-square (rms) form.
2. The highest rms current that an amplifier can
deliver to a load of a specified impedance.
output meter A meter that gives a quantitative or
qualitative indication of the output of an amplifier
or generator. See, for example, OUTPUT-POWER
METER.
output offset In an integrated circuit, the voltage
at the output when the inputs are grounded.
output port The output terminal of a logic device.
output power Symbol, P o . The power deliverable by
an amplifier, generator, or circuit. Also called
power output. Compare INPUT POWER.
output-power meter A type of direct-reading
wattmeter for measuring the power output of an
amplifier or generator.
output regulator A circuit or device that automatically
maintains the output of a power supply or
signal source at a constant amplitude.
output resistance Symbol, R o . The internal resistance
of a circuit or device, as “seen” at the output
terminals. Compare INPUT RESISTANCE.
output routine In computer operations, a routine
(program segment) that performs the work involved
in moving data to an output device, often
including intermediate transferals and modifying
the data as necessary.
output section See OUTPUT AREA.
output sink current In an integrated circuit, for a
specified set of conditions at the input and output,
current into the output as measured in milliamperes
or microamperes.
output source current In an integrated circuit, for
a specified set of conditions at the input and output,
the current out of the output, as measured
in milliamperes or microamperes.
output stage The last stage of an amplifier. Delivers
the signal to the load.
output terminals Terminals (usually a pair) associated
with the output of a circuit or device (see
OUTPUT, 1, 2). Compare INPUT TERMINALS.
output tank In a transmitter or power generator, a
parallel-tuned combination of inductance and capacitance
in the collector, drain, or plate circuit,
that is generally tuned to resonance at the operating
frequency. IT optimizes efficiency and couples
the signal to the load. Compare INPUT TANK.
output transformer The output-coupling transformer
that delivers signal voltage or power from
an amplifier, generator, or network to a load or to
another circuit. Compare INPUT TRANSFORMER.
Input
+
Output
tank
output tank
+
Output