Input impedance, the Glossary
In electrical engineering, the input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into a load network that is external to the electrical source network.[1]
Table of Contents
37 relations: Admittance, Amplifier, Antenna (radio), Buffer amplifier, Complex conjugate, Damping factor, Dummy load, Electric arc, Electric current, Electric power, Electrical breakdown, Electrical engineering, Electrical impedance, Electrical load, Electrical network, Electrical reactance, Electrical resistance and conductance, Farad, Field-effect transistor, Impedance bridging, Impedance matching, Mains hum, Maximum power transfer theorem, Multiplicative inverse, Nominal impedance, Ohm, Ohm's law, Operational amplifier, Output impedance, Power (physics), Signal processing, Standing wave, Thévenin's theorem, Transmission line, Transmitter, Vacuum tube, Voltage divider.
- Audio amplifier specifications
Admittance
In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow.
See Input impedance and Admittance
Amplifier
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current).
See Input impedance and Amplifier
Antenna (radio)
In radio engineering, an antenna (American English) or aerial (British English) is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
See Input impedance and Antenna (radio)
Buffer amplifier
In electronics, a buffer amplifier is a unity gain amplifier that copies a signal from one circuit to another while transforming its electrical impedance to provide a more ideal source (with a lower output impedance for a voltage buffer or a higher output impedance for a current buffer).
See Input impedance and Buffer amplifier
Complex conjugate
In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign.
See Input impedance and Complex conjugate
Damping factor
In an audio system, the damping factor is defined as the ratio of the rated impedance of the loudspeaker (usually assumed to be) to the source impedance of the power amplifier. Input impedance and damping factor are audio amplifier specifications.
See Input impedance and Damping factor
Dummy load
A dummy load is a device used to simulate an electrical load, usually for testing purposes.
See Input impedance and Dummy load
Electric arc
An electric arc (or arc discharge) is an electrical breakdown of a gas that produces a prolonged electrical discharge.
See Input impedance and Electric arc
Electric current
An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.
See Input impedance and Electric current
Electric power
Electric power is the rate of transfer of electrical energy within a circuit.
See Input impedance and Electric power
Electrical breakdown
In electronics, electrical breakdown or dielectric breakdown is a process that occurs when an electrically insulating material (a dielectric), subjected to a high enough voltage, suddenly becomes a conductor and current flows through it.
See Input impedance and Electrical breakdown
Electrical engineering
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism.
See Input impedance and Electrical engineering
Electrical impedance
In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.
See Input impedance and Electrical impedance
Electrical load
An electrical load is an electrical component or portion of a circuit that consumes (active) electric power, such as electrical appliances and lights inside the home.
See Input impedance and Electrical load
Electrical network
An electrical network is an interconnection of electrical components (e.g., batteries, resistors, inductors, capacitors, switches, transistors) or a model of such an interconnection, consisting of electrical elements (e.g., voltage sources, current sources, resistances, inductances, capacitances).
See Input impedance and Electrical network
Electrical reactance
In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance.
See Input impedance and Electrical reactance
Electrical resistance and conductance
The electrical resistance of an object is a measure of its opposition to the flow of electric current.
See Input impedance and Electrical resistance and conductance
Farad
The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI), equivalent to 1 coulomb per volt (C/V).
Field-effect transistor
The field-effect transistor (FET) is a type of transistor that uses an electric field to control the flow of current in a semiconductor.
See Input impedance and Field-effect transistor
Impedance bridging
In audio engineering and sound recording, a high impedance bridging, voltage bridging, or simply bridging connection is one in which the load impedance is much larger than the source impedance.
See Input impedance and Impedance bridging
Impedance matching
In electrical engineering, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value.
See Input impedance and Impedance matching
Mains hum
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.
See Input impedance and Mains hum
Maximum power transfer theorem
In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a power source with internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.
See Input impedance and Maximum power transfer theorem
Multiplicative inverse
In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity, 1.
See Input impedance and Multiplicative inverse
Nominal impedance
Nominal impedance in electrical engineering and audio engineering refers to the approximate designed impedance of an electrical circuit or device. Input impedance and Nominal impedance are audio amplifier specifications and electrical parameters.
See Input impedance and Nominal impedance
Ohm
The ohm (symbol: Ω, the uppercase Greek letter omega) is the unit of electrical resistance in the International System of Units (SI).
Ohm's law
Ohm's law states that the electric current through a conductor between two points is directly proportional to the voltage across the two points.
See Input impedance and Ohm's law
Operational amplifier
An operational amplifier (often op amp or opamp) is a DC-coupled electronic voltage amplifier with a differential input, a (usually) single-ended output, and an extremely high gain.
See Input impedance and Operational amplifier
Output impedance
In electrical engineering, the output impedance of an electrical network is the measure of the opposition to current flow (impedance), both static (resistance) and dynamic (reactance), into the load network being connected that is internal to the electrical source. Input impedance and output impedance are audio amplifier specifications and electrical parameters.
See Input impedance and Output impedance
Power (physics)
Power is the amount of energy transferred or converted per unit time.
See Input impedance and Power (physics)
Signal processing
Signal processing is an electrical engineering subfield that focuses on analyzing, modifying and synthesizing signals, such as sound, images, potential fields, seismic signals, altimetry processing, and scientific measurements.
See Input impedance and Signal processing
Standing wave
In physics, a standing wave, also known as a stationary wave, is a wave that oscillates in time but whose peak amplitude profile does not move in space.
See Input impedance and Standing wave
Thévenin's theorem
As originally stated in terms of direct-current resistive circuits only, Thévenin's theorem states that "Any linear electrical network containing only voltage sources, current sources and resistances can be replaced at terminals by an equivalent combination of a voltage source in a series connection with a resistance.".
See Input impedance and Thévenin's theorem
Transmission line
In electrical engineering, a transmission line is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner.
See Input impedance and Transmission line
Transmitter
In electronics and telecommunications, a radio transmitter or just transmitter (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna with the purpose of signal transmission up to a radio receiver.
See Input impedance and Transmitter
Vacuum tube
A vacuum tube, electron tube, valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
See Input impedance and Vacuum tube
Voltage divider
In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin).
See Input impedance and Voltage divider
See also
Audio amplifier specifications
- Audio power
- Audio system measurements
- Crossover distortion
- Crosstalk
- Damping factor
- Distortion
- Dynamic range
- Frequency response
- Input impedance
- Intermodulation
- Nominal impedance
- Output impedance
- Phase distortion
- Power bandwidth
- Power gain
- Signal-to-noise ratio
- Total harmonic distortion
References
[1] https://en.wikipedia.org/wiki/Input_impedance
Also known as External impedance, Input resistance, Load impedance, Load resistance.