18WuD2x

series-fed amplifier • serrated rotor plate 621
series-fed amplifier An amplifier circuit in which
the operating voltages are applied in series with
the alternating-current signal voltages. Also see
SERIES FEED.
series-fed oscillator An oscillator circuit in which
the direct-current operating voltage is applied in
series with the alternating-current output voltage.
Also see SERIES FEED.
series feed The application of alternating-current
(ac) and direct-current (dc) voltages in series to a
device. Example: the presentation of the dc operating
voltages for an amplifier in series with
the ac signal voltages (see SERIES-FED AMPLI-
FIER).
series feedback A feedback system in which the
feedback signal is presented to the input point in
series with the input signal. Compare SHUNT
FEEDBACK.
series field A magnetic field produced by a series
winding in a motor or generator.
series generator An electric generator in which the
armature and field windings are connected in series.
Compare SHUNT GENERATOR.
series inductance 1. Inductance acting, effectively,
in series with some other quantity (e.g., the
inherent inductance of a wirewound resistor).
2. An inductance connected in series with other
inductances, or with some other quantity (e.g.,
capacitance and resistance).
series inductors Inductors connected in series,
and separated or oriented in a way that minimizes
the effects of mutual inductance. Assuming
zero mutual inductance, if the individual inductors
have values L1, L2, . . . , Ln, then the total inductance
Lt is equal to L1 + L2 + . . . + Ln. Also see
SERIES CIRCUIT.
series limiter A limiter (clipper) circuit in which
the diode is essentially in series with the signal.
Compare PARALLEL LIMITER.
series loading The series insertion of reactances
in a circuit for the purpose of impedance
matching.
series magnetic circuits A combination of several
magnetic paths in line so that flux extends
through each path in sequence; this is analogous
to the passage of electric current successively
through series-connected resistors.
series motor An electric motor whose armature
and field windings are connected in series. Compare
SHUNT MOTOR.
series operation The operation of units in succession,
necessitating sequential current flow
through each. Also see SERIES CIRCUIT.
series opposition See SERIES BUCKING.
series-parallel See PARALLEL-SERIES.
series-parallel capacitors See PARALLEL-SERIES
CAPACITORS.
series-parallel inductors See PARALLEL-SERIES
INDUCTORS.
series-parallel resistors See PARALLEL-SERIES
RESISTORS.
series regulator A voltage regulator circuit in
which the controlled device is in series with the
load. Compare SHUNT REGULATOR.
series resistance 1. Resistance acting in series
with another resistance or with another quantity
(e.g., capacitance and inductance). 2. The inherent
resistance that acts effectively in series with
the plates of a capacitor. 3. The resistance of the
wire in a coil, acting effectively in series with the
inductance.
series resistors Resistors connected in series with
each other. If the individual resistors have values
R1, R2, . . . , Rn, then the total resistance Rt is
equal to R1 + R2 + . . . + Rn. Also see SERIES
CIRCUIT.
series resonance Resonance in a circuit consisting
of a capacitor, inductor, and an alternatingcurrent
generator in series. At the resonant frequency,
the inductive reactance and the
capacitive reactance cancel, so the net reactance
is zero. The capacitor current and inductor
current are maximum and equal, and the circuit
impedance is minimum. Compare PARALLEL
RESONANCE.
series-resonant circuit A resonant circuit in
which the capacitor, inductor, and generator are
connected in series. Also see SERIES RESO-
NANCE. Compare PARALLEL-RESONANT CIR-
CUIT.
series-resonant trap A wavetrap consisting of a
series-resonant inductance-capacitance (LC) circuit.
Compare PARALLEL-RESONANT TRAP.
series-resonant wavetrap See SERIES-RESO-
NANT TRAP.
series-shunt circuit See PARALLEL-SERIES.
series tee junction See E-PLANE TEE JUNCTION.
series tracking capacitor See OSCILLATOR PAD-
DER.
series-type frequency multiplier A varactor frequency-multiplier
circuit in which the varactor is
in series with the input and output. Compare
SHUNT-TYPE FREQUENCY MULTIPLIER.
series-type resonance bridge A resonance bridge
in which the impedance arm is a series-resonant
circuit. Compare SHUNT-TYPE RESONANCE
BRIDGE.
series winding 1. In a motor or generator, a winding
connected in series with the armature. 2. A
method of motor or generator construction in
which the field winding is connected in series
with the armature.
series-wound generator See SERIES GENERA-
TOR.
series-wound motor See SERIES MOTOR.
serrated pulse A pulse having a notched or slotted
top. An example is the vertical sync pulse in television.
serrated rotor plate In a variable capacitor, an external
rotor plate that is slotted radially. This alters
the capacitance-variation curve of the
capacitor to allow alignment of sensitive apparatus