Learn about inductor all definitions

Inductor A coil of wire wound according to various designs, with or without a core of ferromagnetic material, to concentrate the magnetic flux resulting from current flowing in the wire. The coiling of the wire and/or the addition of a ferromagnetic

core increases the self-inductance compared with that of a straight wire having the same length. Also see INDUCTANCE; INDUCTION, 1; and SELF-INDUCTANCE, 1.

inductor alternator See ALTERNATOR.

inductor amplifier See MAGNETIC AMPLIFIER.

inductor decade See DECADE INDUCTOR.

inductor microphone See INDUCTIVE MICROPHONE.

inductors in parallel See PARALLEL INDUCTORS.

inductors in parallel-series See PARALLELSERIES

INDUCTORS.

inductors in series See SERIES INDUCTORS.

inductors in series-parallel See SERIES-PARALLEL

INDUCTORS.

inductor substitution box An enclosed assortment of common-value inductors that can be switched, one at a time, to a pair of terminals. In troubleshooting and circuit development, any of several useful fixed inductances can be thus obtained.

inductance Symbol, L. Unit, henry. In a conductor,device, or circuit, the inertial property (caused by an induced reverse voltage) that opposes the flow of current when a voltage is applied;

it opposes a change in current that has been established. Also see HENRY, INDUCTION, and MUTUAL INDUCTANCE.

inductance bridge An alternating-current bridge for measuring inductance in terms of a standard inductance or a standard capacitance. See, for example, HAY BRIDGE, MAXWELL BRIDGE, and OWEN BRIDGE.

inductance-capacitance Abbreviation, LC. 1. A combination of inductance and capacitance in a circuit, such as a filter, a parallel-resonant circuit, or a series-resonant circuit. 2. Pertaining to a device for measuring inductance and capacitance (e.g., LC bridge and LC meter).

inductance-capacitance bridge An alternatingcurrent bridge for measuring inductance and capacitance only.

inductance-capacitance filter A filter composed of inductors and capacitors. Also called LC filter.

inductance-capacitance meter A direct-reading meter for measuring inductance and capacitance.

inductance-capacitance-resistance Abbreviation,LCR. 
1. A combination of inductance, capacitance,and resistance in a           circuit, such as a basic tuned circuit. The resistive component           represents loss in the inductor and capacitor. 
2. Pertaining to a device for measuring inductance, capacitance,

    and resistance (e.g., LCR bridge and LCR meter).

inductance-capacitance-resistance bridge See IMPEDANCE BRIDGE.

inductance coil See INDUCTOR.

inductance filter A filter using only an inductor,usually a coil of wire.

inductance-resistance time constant The time constant t (see ELECTRICAL TIME CONSTANT) of a circuit containing, ideally, only inductance and resistance. Mathematically, t = LR, where t is in seconds, L is the inductance in henrys, and R is the resistance in ohms. Also called LR time constant.

inductance standard A highly accurate, stable inductor

used in precision measurements. Also see

PRIMARY STANDARD and SECONDARY STANDARD.

induction 

1. The ability of an alternating, pulsating,

    or otherwise changing current flowing in one

    circuit to set up a current in a nearby circuit. The

    circuits need not be physically connected, but

    need only be linked by magnetic lines of flux. Also

    see SELF-INDUCTION. 

2. The phenomenon

     whereby a body becomes electrically charged by

     the field surrounding a nearby charged body.

     Also see ELECTRIC CHARGE.

induction coil A special high-voltage step-up transformer having an open core and a vibratorinterrupter in series with the primary winding,which carries direct current from a battery. The current is broken up into short pulses by the interrupter,and a high alternating-current voltage is generated in the secondary winding.

induction compass A compass whose indications depend on current induced in a coil revolving in the earth’s magnetic field. Compare GYROCOMPASS and MAGNETIC COMPASS.

induction factor The ratio of total current to nonproductive

current in an alternating-current circuit.

induction field The portion of an electromagnetic field that returns to a radiator, such as a coil, as opposed to the RADIATION FIELD.

induction frequency converter A mechanical device used for converting a signal at a fixed frequency to a signal at another fixed frequency.

induction furnace A furnace in which highfrequency magnetic fields induce currents in metal ores, causing the ore to become hot enough to melt.

induction heater A high-power, radio-frequency generator designed especially for induction heating.

induction heating The heating of metallic work samples by placing them in (but insulated from) a WORK COIL carrying current from a high-power radio-frequency generator. The workpiece is heated

by radio-frequency currents induced in it as a result of the intense alternating magnetic field within the coil. Compare DIELECTRIC HEATING.

induction loss Loss of energy from a currentcarrying conductor because of inductive coupling to a nearby conductor.

induction modulator See ELECTROMECHANICAL

MODULATOR.

induction motor An electric motor in which the stator’s rotating magnetic field makes the rotor revolve.

induction speaker An acoustic loudspeaker in which an audio-frequency current is passed through a diaphragm or coil located in a constant magnetic field. This results in movement of the diaphragm or coil.

induction transducer See INDUCTIVE TRANSDUCER.

induction-type landing system See DINGLEY INDUCTION-TYPE LANDING SYSTEM.

induction welding Welding in which the heating current flowing in the workpieces is induced by an electromagnetic field.

inductive capacitor A wound capacitor in which

the inductance of the roll is controlled and specified.

Such a capacitor is useful in compact filters

and in single-frequency bypassing, where the reactive

components are supplied by the capacitor.

Compare NONINDUCTIVE CAPACITOR.

inductive circuit 

1. A circuit in which inductance predominates. 

2. A (theoretical) circuit containing inductance only.

inductive coupling The transfer of energy between two inductors (or inductive devices) by a linking electromagnetic field. Also see COEFFICIENT OF COUPLING, COUPLING, INDUCTION, and MUTUAL INDUCTANCE.

inductive feedback See MAGNETIC FEEDBACK.

inductive heater See INDUCTION HEATER.

inductive heating See INDUCTION HEATING.

inductive kick See BACK VOLTAGE and KICKBACK.

inductive load A load device that approaches a pure inductive reactance (e.g., loudspeaker and electric motor).

inductive loading In an antenna, the addition of

inductance in series with the element(s). This reduces

the resonant frequency for a radiator having

a given physical length. It can also serve to

reduce the physical length required for a radiator having a specified resonant frequency. Compare CAPACITIVE LOADING.

inductive logic A form of reasoning that demonstrates that a certain conclusion is highly probable, given a certain set of circumstances. This is of interest to researchers in artificial intelligence (AI). Compare DEDUCTIVE LOGIC.

inductive microphone A microphone in which sound waves vibrate a conductor or coil in a strong magnetic field, producing a corresponding alternating-current output by the resulting induction.

Example: dynamic microphone.

induction neutralization Neutralization of a vacuum-tube radio-frequency power amplifier, via negative feedback from the output to the input through coupling coils.

inductive reactance Symbol, XL. Unit, ohm. The reactance exhibited by an ideal inductor, considered as a positive imaginary-number quantity; XL= j6.28fL, where XL is in ohms, f is the frequency in Hertz, L is the inductance in henrys, and j is the unit imaginary number (the square root of –1). Alternatively, f can be specified in megahertz,and L in microhenries. In a pure inductive reactance,current lags 90 degrees behind voltage.Also see INDUCTANCE, INDUCTION, INDUCTOR,and REACTANCE.

inductive switching Switching operations in a circuit containing an inductor. Switching time is influenced by the INDUCTANCE-RESISTANCE TIME CONSTANT of the inductor; overall operation is affected by the back voltage generated by the inductor.

inductive transducer A transducer in which the

sensed phenomenon causes a change in inductance (or reluctance), which, in turn, causes a proportional change in output current, voltage,frequency, or bridge balance. 
Compare CAPACITIVE TRANSDUCER, CRYSTAL TRANSDUCER,MAGNETIC TRANSDUCER, and RESISTIVE

TRANSDUCER.

inductive trimmer See TRIMMER INDUCTOR.

inductive tuning Also called permeability tuning. In a radio receiver, transmitter or transceiver, the adjustment of frequency by changing the inductance of a coil having a movable core.

inductivity See DIELECTRIC CONSTANT.

inductometer An instrument for measuring inductance in terms of the resonant frequency of an INDUCTANCE-CAPACITANCE (LC) circuit, in which L is the unknown inductance and C is calibration capacitance.

Learn about capacitor FULL FUNCTION in electronics

capacitor A passive electronic-circuit component
consisting of, in basic form, two metal electrodes

or plates separated by a dielectric (insulator).

capacitor amplifier See DIELECTRIC AMPLIFIER.

capacitor antenna See CONDENSER ANTENNA.

capacitor bank A network of capacitors connected

in combination, yielding a desired characteristic.

capacitor braking The connection of a capacitor to
the winding of a motor after the removal of power,

to speed up the process of braking.

capacitor color code See COLOR CODE.

capacitor decade See DECADE CAPACITOR.

capacitor-discharge ignition CAPACITIVEDISCHARGE

IGNITION.

capacitor filter In a direct-current power supply, a

filter consisting simply of a capacitor connected

in parallel with the rectifier output.

capacitor-input filter A filter whose input component is a capacitor. The capacitor-input powersupply filter is distinguished by its relatively high dc output voltage, but somewhat poorer voltage regulation, compared with the CHOKE-INPUT FILTER.

capacitor leakage Direct current flowing through the dielectric of a capacitor. In a good nonelectrolytic
capacitor, this current is normally less than 1microampere. In an electrolytic capacitor,it can be up to several milliamperes, depending on the capacitance and the applied voltage.


capacitor loudspeaker See ELECTROSTATIC

SPEAKER.

capacitor microphone See CONDENSER MICROPHONE.

capacitor motor An ac motor that uses a capacitor in series with an auxiliary field winding for starting purposes. Initially out-of-phase current in the auxiliary field (starting winding) causes a rotating field that turns the rotor. When the rotor reaches a safe speed, a centrifugal switch disconnects the capacitor and auxiliary field, and the motor continues running as an induction motor.


capacitor series resistance The ohmic loss in a capacitor. It results partly from conductor losses, and partly from losses in the dielectric material.


capacitor substitution box An enclosed assortment of selected-value capacitors arranged to be switched one at a time to a pair of terminals. In troubleshooting and circuit development, any of several useful fixed capacitance values can be

thus obtained.

capacitor voltage 
1. The voltage at the terminals of a capacitor. 
2. The maximum voltage rating of a capacitor.


capacitor voltmeter See ELECTROSTATIC VOLTMETER.


cap 1. Abbreviation of CAPACITANCE. 2. Abbreviation of CAPACITOR

capacitance  Symbol, C. Unit, farad. The property exhibited by two conductors separated by a dielectric, whereby an electric charge becomes stored between the conductors. Capacitance is thought of as analogous to mechanical elasticity.Also see FARAD.

capacitance bridge A four-arm ac bridge for gauging capacitance against a standard capacitor. In its simplest form, it has a standard capacitor in one arm and resistors in the other three

capacitance coupling The transfer of ac energy between two circuits or devices by a capacitor or capacitance effect. Also see COUPLING.

capacitance diode See VARACTOR.

capacitance divider An alternating-current voltage divider that uses capacitors, rather than resistors. It is used in certain oscillators, such as the Colpitts type.

capacitance filter A filter consisting of only a high-capacitance capacitor. Because the capacitor cannot discharge instantaneously, it tends to maintain its voltage and smooth out the ripples in the voltage applied to it.

capacitance-inductance bridge A combination ac bridge that can be used for either capacitance or inductance measurement. Both capacitance and inductance can be measured in terms of a standard
capacitance; however, some of these bridges use standard inductors in the inductancemeasuring mode.

capacitance meter A direct-reading meter for measuring capacitance. In most available types, a stable ac voltage is applied to the meter circuit, to which an unknown capacitor is connected in series; 
meter deflection is roughly proportional to
the reactance of the capacitor. Also called MICROFARAD
METER.

capacitance ratio In a variable capacitor, the ratio of maximum to minimum capacitance.

capacitance relay A relay circuit that operates from a small change in its own capacitance. It consists of an RF oscillator whose tank capacitance is very low. When a finger is brought near the circuit’s short pickup antenna, the attendant increase in capacitance detunes the oscillator, activating the relay. Also called PROXIMITY RELAY and PROXIMITY SWITCH.

capacitance-resistance bridge A combination ac bridge that can be used for either capacitance or resistance measurement. The unknown resistance is measured against a standard resistor;
the unknown capacitance against a standard capacitor.

capacitance sensor See CAPACITANCE TRANSDUCER.

capacitive amplifier See DIELECTRIC AMPLIFIER.

capacitive attenuator An ac attenuator whose elements are capacitors in any desired combination of fixed and/or variable units. The desired attenuation is afforded by the capacitance ratio.

capacitive coupling A means of coupling between
circuits that uses a series capacitor for directcurrent
blocking. The signal passes through the
capacitor, but the blocking effect allows different
bias voltages to be applied to the two stages.







capacitive diaphragm A metal plate deliberately placed in a waveguide to introduce capacitive reactance and, thereby, cancel an inductive reactance.

capacitive-discharge ignition An electronic ignition system for automotive engines. Provides nearly constant high voltage, regardless of engine speed. A dc-to-dc step-up converter charges a
large capacitor (typically to 300 volts) when the distributor breaker points are closed; when they are open, the capacitor discharges through the ignition coil, thereby generating an ignition pulse
of several thousand volts.

capacitive division Reduction of an ac voltage by a capacitive voltage divider.

capacitive feedback Feeding energy back from the output to the input of an amplifier or oscillator through a capacitor.

capacitive-input filter A smoothing filter for ac power supplies, in which the element closest to the rectifier is a capacitor, regardless of the components or circuits placed subsequently.

capacitive load A load consisting of a capacitor or a predominantly capacitive circuit.

capacitive loading In an antenna, the addition of capacitance in series with the element(s). This raises the resonant frequency for a radiator having a given physical length. It can also serve to increase
the physical length required for a radiator having a specified resonant frequency. Compare INDUCTIVE LOADING.

capacitive post A protrusion inside a waveguide for the purpose of introducing capacitive reactance to cancel an inductive reactance.

capacitive potentiometer See CAPACITIVE VOLTAGE
DIVIDER.

capacitive pressure sensor A pressure sensor
that uses a radio-frequency oscillator and a pair
of metal plates separated by dielectric foam. The
circuit is designed so a change in the capacitance
between the plates causes the oscillator frequency
to change. This change is sensed. A signal
is sent to an analog-to-digital converter (ADC)
and then to a microcomputer that calculates the
extent of the pressure.



capacitive proximity sensor A transducer used in mobile robots that detects the presence of certain
kinds of objects. It consists of an oscillator whose
frequency is determined by an inductancecapacitance
(LC) circuit to which a metal plate
is connected. When a conducting or partially conducting
object comes near the plate, the mutual capacitance changes the oscillator frequency. This change is detected and sent to the robot controller.





capacitive reactance Symbol, XC. Unit, ohm. The reactance exhibited by an ideal capacitor, considered as a negative pure-imaginary quantity; XC = –j/(6.28fC), where f is the frequency in
hertz, C is the capacitance in farads, and j is the unit imaginary number (the square root of –1). Alternatively, f can be specified in megahertz and C in microfarads. In a pure capacitive reactance,
current leads voltage by 90 degrees. Also see CAPACITANCE, CAPACITOR, and REACTANCE.

capacitive speaker See ELECTROSTATIC SPEAKER.


capacitive transducer A transducer consisting essentially of a refined variable capacitor whose value is varied by a quantity under test, such as pressure, temperature, liquid level, etc.

capacitive tuning Variable-capacitor tuning of a circuit.

capacitive voltage divider A capacitive attenuator usually consisting of two series-connected capacitors whose values are such that an applied ac voltage is divided across them in the desired ratio.

capacitive welding An electronic welding system in which energy stored in a capacitor is discharged through the joint to be welded. This develops the heat necessary for the operation.

capacitive window A pair of capacitive diaphragms used in a waveguide to introduce capacitive reactance.

Resistance works on some other electronic components.

Resistance: Symbol   = ' R' or r. Unit, "ohm".  

1.In a device,component, or circuit, the simple oppositionto current flow. Resistance by itself causes no
phase shift. In a purely resistive circuit, R = E/I,where R is the resistance in ohms, E is the voltage
in volts, and I is the current in amperes.

2. Aproperty of circuits, devices, or substances that
causes impinging energy to be dissipated by conversion
to heat.
3.Every resistor have some different colours that mean resistor have coding that is called colour coding above shown in above figure resistor is as their on resistor we seeing some colours that is called colour coding.

Compare Resistance

Per kilometer of solid copper wire for American Wire Gauge

(AWG) 1 through 40.

AWG                       ohms/km              AWG                        ohms/km

1                                       0.42                             21                                              43

2                                       0.52                             22                                              54

3                                       0.66                             23                                              68

4                                       0.83                             24                                              86

5                                       1.0                               25                                            110

6                                       1.3                               26                                            140

7                                       1.7                               27                                            170

8                                       2.1                               28                                            220

9                                       2.7                               29                                            270

10                                     3.3                               30                                            350

11                                     4.2                               31                                            440

12                                     5.3                               32                                            550

13                                     6.7                               33                                            690

14                                     8.4                               34                                            870

15                                     11                                35                                           1100

16                                     13                                36                                           1400

17                                     17                                37                                           1700

18                                     21                                38                                           2200

19                                     27                                39                                           2800

20                                     34                                40                                           3500

Resistance alloys:

 Metallic alloys used in the manufacture of resistance wire and resistance elements.Such alloys include 

                 CONSTANTAN,

                 GERMAN SILVER, 

                 MANGANIN, 

                 MONEL METAL,

                 and NICHROME.

Resistance balance: A device used to balance a circuit,by means of the insertion of resistances.

Resistance brazing: A method of brazing in which metal is heated by passing a current through it. The I2R loss, or dissipated power, occurs in the form of heat.

resistance bridge: A bridge (see BRIDGE, 2) for measuring resistance only.

resistance-capacitance: Abbreviation, RC. Pertaining to a combination of resistance and capacitance
(e.g., RESISTANCE-CAPACITANCE CIRCUIT).

resistance-capacitance bridge:  1. A four-arm null circuit containing only resistors and capacitors.
Also see BRIDGE, 1. 2. An alternating-current
bridge (see BRIDGE, 2) for measuring resistance
and capacitance.

resistance-capacitance: circuit A circuit containing only resistors and capacitors. There are no inductors.

resistance-capacitance-coupled amplifier :
A multistage amplifier circuit in which RESISTANCE-CAPACITANCE COUPLING is used between stages and at the input and output points of the circuit.

resistance-capacitance coupling:

Coupling, especially between stages in a circuit, using blocking
capacitors and supply-path resistors.

resistance-capacitance filter: A power-supply filter or wave filter containing only resistors and capacitors.The resistors are in the positions occupied by inductors in inductance-capacitance filters. 

resistance-capacitance-inductance: Abbreviation,RCL. Pertaining to a combination of resistance,capacitance, and inductance

resistance-capacitance phase shifter: A phaseshifter containing only resistors and capacitors to obtain the desired shift.

 resistance-capacitance phase shifter  

resistance-capacitance time constant: Symbol, t.The time constant (see ELECTRICAL TIME CONSTANT) of a circuit containing (ideally) only resistance and capacitance; t = RC, where t is in seconds, R is in ohms, and C is in farads. Compare RESISTANCE-INDUCTANCE TIME CONSTANT. 

resistance-capacitance tuning Tuning Of a circuit,such as that of an amplifier or oscillator, by means of a variable resistor or ganged units of this type. See, for example, PARALLEL-TEE AMPLIFIER,PARALLEL-TEE OSCILLATOR, and 
WIEN-BRIDGE OSCILLATOR

resistance-coupled amplifier: 
ee RESISTANCECAPACITANCE-COUPLED AMPLIFIER.

resistance drop:The voltage drop across a resistor, or across the inherent resistance of a device 

resistance-inductance:Abbreviation, RL. Pertaining to a combination of resistance and inductance (e.g., RESISTANCE-INDUCTANCE CIRCUIT).

resistance-inductance bridge: 

                                             1. A four-arm null circuit containing only resistors and inductors.Also see BRIDGE, 1. 2. An alternating-current bridge (see BRIDGE, 2) for measuring resistance and inductance only.

resistance-inductance circuit:
                      A circuit containing only resistors and inductors. There are no capacitors

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.                                                                                                                                                   

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 RESISTANCE 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 SECONDARY 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 ALLOYS 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 TRANSDUCER.

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.