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**"Impedance"****Related Terms:**Capacitive reactance, Reactance, Inductive reactance, Ohm's law, Resistance, Ohm, Conductance, Siemens, Ohms law, Ohms, Short-circuit current, Resistor, Voltage drop, Choke, Overcurrent, Electrical resistance, Electrical current, Conductive, Amperage, Negative resistance, Ammeter, Rheostat, Resistive load, Current , Ampère, Vom, Amp , Internal resistance, Short circuit current, Electric current, Quality factor, Fault current, Displacement current, Capacitance, Parallel circuit, Mho, Volume resistivity, Inductive load, Quiescent current, Leakage current, Multimeter , Voltage, Series circuit, Ohmmeter, Direct current, Short circuit, Ampacity, Resistivity, Varistor

The apparent resistance in an electric circuit to the flow of an alternating current, analogous to the actual electrical resistance to a direct current, being the ratio of electromotive force to the current. It is equal to R2 + X2, where R = ohmic resistance, X = reactance. For an inductive circuit, X = 2pfL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 / 2pfC, where C = capacity.

A term for the different voltage/current ratios that are used in audio. Terms for impedance are things like 8 ohms, 600 ohms, 10 K ohms, low impedance and high impedance.

The apparent opposition to the flow of current though an AC electrical circuit; a force that literally impedes the flow of current.

The amount of resistance to the flow of current. Impedance varies with the frequency of the input signal.

A complex number that expresses the combined effects of resistance, compliance and inertance on sinusoidally-varying breathing variables at a given frequency. The combination of the latter two parameters incorporates the frequency into a term called the reactance.

the total apparent opposition a circuit offers to the flow of alternating current in an electrical circuit.

The AC version of DC resistance (Re). Speaker impedance is a nominal value. True impedance actually varies with frequency. Impedance is actually resistance, affected by capacitance and inductance, which vary the phase angle of the actual impedance load. The formula for figuring total impedance (Zt) of multiple impedances in parallel on a single circuit is: Zt=1/(1/Z1+1/Z2+1/Z3+1/Z4...). Don't forget to find a common denominator. (Example: The total impedance of an 8ohm speaker and a 4ohm speaker in parallel is 2.67 ohms, figured as follows: 1/8+2/8= 8 divided by 3 or 2.67). Impedance in series is simply additive: Zt=Z1+Z2+Z3+Z4... The two methods can be combined to control the impedance of multiple speaker arrays. Example: The Ampeg SVT 8x10 cabinet load consists of four parallel legs of two 8ohm speakers in series each. Each leg=16ohms, 16/4=4ohms.

The total opposition a circuit offers to the flow of an alternating current at a particular frequency. A combination of D.C. resistance & reactance, or in other words, the friction or back pressure. Impedance is measured in ohms. Consistency is met when speed (frequency) increases.

A measure of the opposition that an electronic component, circuit, or system offers to alternating and/or direct electric current.

The resistance to the flow of current caused by resistive, capacitive, or inductive devices (or undesired elements) in a circuit.

Combination of resistance, inductance, frequency, and capacitance (sometimes called A.C. resistance).

In a direct current (DC) circuit it is synonymous with resistance. In an alternating current (AC) circuit, it is the interaction of inductive and capacitive forces as well as resistance.

The total opposition (i.e., resistance or reactance) a circuit offers to the flow of alternating current. It is measured in ohms and the lower the ohmic value, the better the quality of the conductor.

the total opposition offered to the flow of an alternation current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance, inductive reactance, and capacitive reactance. It is measured in ohms and the lower the ohm value the better the quality of the conductor.

Describes overall resistance in circuit with alternating current. Also used in fluid flow circuits.

The ratio of electric to magnetic field (E/H) With waves, we speak of "WAVE IMPEDANCE." The wave impedance depends on the distance from the source. In the far field, the wave is known as a plane wave and its impedance is equal to the impedance of free space 377 ohm. In the near field , the wave impedance is determined by the characteristics of the source. In terms of a medium, impedance is the quality of a material which can be calculated from its magnetic and dielectric properties. The closer the values of the impedance of two materials, the less reflectivity will occur at their boundaries. If there is an impedance match there will be no reflectivity.

An electrical property. A low impedance draws a high current flow from the source, while a high impedance draws less. This tends to mean that loudspeakers with a low impedance (lower than 6-8 ohms) are more difficult for an amplifier to drive. Amplifiers have different power ratings depending on impedance values.

The total opposition offered by a device or circuit to the flow of alternative current.

The total opposition offered to the flow of an alternating current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance. The symbol for impedance is Z.

Measured in ohms, impedance describes the input and output characteristic of an electrical system. For the best signal quality, both input and output impedances should be equal, with CCTV systems having 75-ohm impedance throughout.

The total opposition presented by a circuit or device to the flow of alternating current. Impedance is measured in "ohms" and is represented by the letter "Z."

The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. More about isotopes...

The total opposition offered by a device to the flow of an alternating current. Measured in Ohms Î©

A unit of measure, expressed in Ohms, of the total opposition (resistance, capacitance and inductance) offered to the flow of an alternating current.

Opposition to the flow of current in a line. Excessive impedance can cause signal loss and data errors.

Measured in ohms, this is a measure of resistance to an amplifier's power. Most car audio speakers, including subwoofers, are rated at 4 ohms. Note: this specification has nothing to do with sound quality.

The vector sum of resistance and reactance, which limits the current flow in an AC circuit. Impedance is identified in percentage and is used to determine the interrupting capacity of circuit breakers, which protect the primary circuit.

A resistor offers electrical resistance in DC circuits, whilst in AC circuits it offers an impedance.

a property of a circuit component, instrument or some other device which encapsulates the relationship between the potential difference (PD) across the device and the current through it. For steady (constant) PD and current, the impedance is equivalent to the resistance, the quotient of PD divided by current, but if the PD and current vary with time, you have to take into account the fact that there may be some delay between cause and effect - potential differences and currents may not change in unison. To specify impedance in such cases you have to know, as well as resistance, a second property called reactance which depends on the relationship among PD, current and the time scale of the changes. The two properties, resistance and reactance, together constitute impedance which cannot be described by a single numerical value. In DC circuits - with steady currents - the reactance of all components can be ignored, so in those cases impedance means the same as resistance. Some folks, such as loudspeaker salespersons, say impedance when they mean resistance.

Measured in Ohms, refers to the combined resistance a reactance in an electrical surface.

Used in terms of the battery's internal resistance.

Ratio of voltage to current expressed in ohms. This measurement shows the resistance to the AC current flow. Impedance between circuits must be matched in certain design situations. See also OHM.

The measure of total opposition to the flow of electric current, especially in an alternating current circuit.

The AC resistance in an electrical circuit. Impedance is the combination of DC resistance and AC capacitance and inductance measured in ohms. Impedance can’t be measured by a DC ohmmeter.

The AC resistance of a circuit which has both resistive and reactive components.

occurs when power or signal is transferred from one circuit to another. This is known as the resistance of electrical current to alternating current and it is measured in OHMs.

The opposition or load to a signal, measured in ohms and abbreviated W or Z. In video, typical low impedance circuits (low Z) are 600 ohms or less and high impedance circuits (high Z) may be 10 k ohms or greater. Video termination impedance is 75 ohms. See " High impedance" and " Low impedance."

The opposition to the flow of an AC signal offered by a circuit or device. See also RF Impedance, Hi-Z, Lo-Z.

The total opposition a circuit offers to the flow of alternating current at a given frequency. Its symbol is "Z." Its measurement unit is the ohm.

Measurement of the opposition to the flow of electrons in a cable. The combination of Resistance, Capacitance & Inductance.

The total passive opposition offered to the flow of electric current. This term is generally used to describe high-frequency circuit boards.

Vector sum of resistance and reactance of a dynamic system, as measured across a pair of terminals.

A load applied to an amplifier (or other source) which is not a pure resistance. This is to say that its loading characteristics are frequency dependent. Impedance consists of some value of resistance in conjunction with capacitance and/or inductance. The equivalent circuits can vary from two components to hundreds.

Apparent resistance to the flow of current in an AC circuit, directly related to the circuit's true resistance to the flow of direct current.

Characteristic property of a transmission line describing the ratio between electric and magnetic fields.

Electrical property. A low impedance draws a high current flow from the source, while a high impedance draws a little. This means that speakers with a low impedance (lower than 6-8ohms) are more difficult for an amplifier to drive.

The term that describes resistance in an AC circuit.

Electrical property. A low impedance draws a high current flow from the source amplifier; high impedance draws little. Therefore speakers with a low impedance (lower than 6-8 ohms) are more difficult for an amplifier to drive.

The total opposition to current flow presented by a component or a circuit. This may include any or all of the principles of INDUCTANCE, CAPACITANCE, or RESISTANCE.

The opposition to the flow of electricity or acoustic energy. In electronics is measured in ohms. Named after German physicist Georg Simon Ohm (1789-1854).

the ratio of the voltage applied to a circuit to the current flowing in the circuit; similar to resistance, but applicable to alternating currents and voltages

In a circuit, the opposition that circuit elements present alternating current. The impedance includes both resistance and reactance.

a material's opposition to the flow of electric current; measured in ohms

a combination of resistance, capacitance, and inductance

a resistance value, that is for instance when a battery is loaded with a light, the voltage, normally e

The total opposition to the flow of alternating current in an electrical circuit. Impedance is measured in ohms.

The opposition in an electric circuit to the flow of an alternating current. It consists of ohmic resistance, inductive reactance, and capacitive reactance.

Resistance that opposes the flow of alternating current.

Opposition to the flow of ac current; the equivalent of resistance in dc circuits. The unit is the ohm. The impedance of an ac circuit is one ohm if a potential difference of one volt creates a current flow of one ampere within it.

The technically correct term for the resistance produced by inductors, capacitors, and networks. For the technically minded, the real part of an impedance is equal to resistance, and the imaginary part is called reactance.

Resistance to electrical current flow, usually proportional to frequency.

The total opposition to electrical flow in an ac circuit.

Resistance to alternating current. In general, this refers to the load of a signal input or output. The input/output jacks of the AW products have specific impedances depending on their type or intended input/output signal, and must be connected to a device of the same or similar impedance. Even if its cable connector has the same form as a line input, a high-impedance source such as a guitar must be connected to a high-impedance jack, not to a regular input.

The resistance of a circuit (cable, passive devices are examples) to alternating current. Although impedance is measured in ohms, it can't be measured with the ohm portion of a volt-ohm meter.

The amount of resistance (or cost) required to traverse through a portion of a network such as a line, or through one cell in a grid system. Resistance may be any number of factors defined by the user such as travel distance, time, speed of travel times the length, slope, or cost.

The property of an electrical circuit which tends to impede the flow of electrical current. In alternating current circuits, impedance is the vector sum of reactance and resistance. Reactance may be either capacitive or inductive. In practical electrical circuits, impedance is usually the result of conductor resistance and circuit inductance.

Nominal impedance of the device. The variation of this impedance with frequency is measured as VSWR.

the sum of the resistance (opposition to DC) and reactance in an electrical cable. Note that it is expressed in ohms as is simple DC resistance.

In electronics: the opposition to alternating current flow in a circuit or device. Properly expressed as a complex quantity, it is also simplified as a magnitude only. The latter is commonly used in describing the impedance of loudspeaker drivers and systems. There are also acoustical and mechanical impedances.

The total opposition (in Ohms) to ac flow presented by a circuit. Usually just referred to as either "high" or "low"

The vector ratio of voltage to current, the reciprocal of admittance. The unit of impedance is the ohm (×). Impedance is typically abbreviated as "z" or "Z". The frequency-invariant, real component of impedance is resistance. The frequency-variant, imaginary component of impedance is reactance. The reciprocal of impedance is admittance.

The ratio of the voltage across a device or circuit to the current flowing in it. In AC circuits, the impedance takes into account the effects of capacitance and inductance. In most data acquisition specifications, the impedance listed is actually the DC impedance, which is the same as the resistance (in ohms).

the factor that relates the peak voltage to the peak current, represented by in equations (see equation 21.21)

Impedance is a measure of resistance to electrical current. (See also Characteristic Impedance.)

The total opposition (resistance, capacitance and inductance) offered to the flow of an alternating current. You can think of impedance as resistance (Ohms) that can vary at different frequencies.

A measurement of the resistance to the audio current by the voice coil of the speaker.

In an electrical circuit, opposition to the flow of alternating current, measured in ohms. A high- impedance microphone has an impedance of 10,000 ohms or more. A low-impedance microphone has an impedance of 50 to 600 ohms.

A form of electrical resistance observed in an alternating current that is analogous to the classic electrical resistance that occurs in a direct current.

Generally defined in ohms (Î©), impedance is the electrical load that is presented by the headphone to the sound source driving the headphone. In general, both consumer and professional headphones have impedances less than 100 ohms. Although impedance used to be important for identifying amplifier shortcomings, now it is primarily used to determine the number of headphones that can operate off of a single amplifier.

The opposition in an electrical circuit to the flow of alternating current (AC). The ratio of electromotive force to the effective current.

A measure of the total opposition to current flow in an alternating current circuit, made up of two components. With higher speed and bandwidth networks, the impedance of the cable plant as a whole can affect the networks performance.

An electrical word. Impedance is like resistance but for AC circuits instead of DC. Itâ€™s units are Ohms, the same as resistance. To illustrate the difference (example due to Wil Lam): when direct current (DC) is first applied to a capacitator, its resistance is very low. But, when AC is applied to a capacitator, its impedance is very high.

A measure of a systemâ€(tm)s opposition to the flow of electrical current.

The Resistance (Ohms) In electrical or electronic circuits.

Impedance ratings are included to offer an idea of how difficult a load the speakers are as far as the amp is concerned. Plugging a 4 ohm speaker into an amp rated at 8 ohms and above will damage the speaker and/or amp at louder levels, as it cannot handle the current demands of the lower impedance speaker. That being said, some ampsare perfectly capable of driving a 4 ohm speaker and will infact sound better when driving lower impedance speakers.

The complex ratio of voltage to current.

A property of all metallic and electrical conductors that describes the total opposition to current flow in an electrical circuit. Resistance, inductance, capacitance and conductance have various influences on the impedance, depending on frequency, dielectric material around conductors, physical relationship between conductors and external factors. Impedance is often referred to with the letter Z. It is measured in ohms, whose symbol is the Greek letter omega - W.

Opposition to the flow of an alternating current ( music is one form of alternating current). Although impedance and resistance share the same unit of measurement, the Ohm, they are not the same thing. In an electrodynamic speaker, the impedance varies with the frequency of the signal being applied to it.

The measure of the total resistance to the current flow expressed in ohms (‡), in an alternating current circuit. It is an important characteristic of electrical devices (particularly speakers and microphones). Most speakers are rated at 4 or 8 ohms. Microphones are usually classified as being either high impedance (10,000 ohms or greater) or low impedance (50 ohms to 600 ohms).

1) A term for the electrical resistance found in a/c circuits. Affects the ability of a cable to transmit low level (e.g. sound) signals over a long distance. Measured in Ohms. Speakers are rated according to power handling capabilities (Watts, W) and impedance (Ohms). 2) The total opposition offered by an electric circuit to the flow of an alternating current of a single frequency. It is a combination of resistance and reactance and is measured in ohms. Remember that a speaker's impedance changes with frequency, it is not a constant value. 3) The opposition to alternating current.

A measure of the impediment to the flow of alternating current, measured in ohms at a given frequency. Larger numbers mean higher resistance to current flow.

The measure of total resistance to the current flow in an alternating current circuit; expressed in ohms, as a characteristic of electrical devices (particularly speakers and microphones). Most speakers are rated at 8 ohms. Microphones are usually classified as being either high impedance (10,000 ohms or greater) or low impedance (50 to 250 ohms).

The total opposition (i.e., resistance and reactance) a circuit offers to the flow of alternating current at a given frequency.

Similar to electrical resistance, since it is a measure of the opposition to the flow of electrical current. Impedance is meaningful only for a changing current and changes value as the frequency of the applied waveform changes.

Impedance is the opposition offered by a material to the flow of an electrical current in an AC electrical system. Impedance has two parts - resistance and reactance. Impedance is measured in ohms.

The combined effect of a speaker's resistance, inductance, and capacitance that opposes the current fed to it. It is measured in ohms and varies with the frequency of the signal.

A measure of materials' resistance to the transfer of electricity.

A measure of the total opposition to the flow of alternating current ( A.C.) round a circuit; a complex combination of ohm ic resistance and reactance.

A measure of the total opposition to current flow in an alternating current circuit. Unit of measure used to describe impedance is ohms.

Measured in ohms, impedance is the total opposition to the flow of alternating current in a circuit.

The total resistance to the flow of current through a conductor, including resistance produced by tissue and electronic components including capacitors. In pacing, impedance and resistance are sometimes used interchangeably, but strictly speaking, impedance involves a fluctuation in resistivity, whereas resistance is a fixed number (an instantaneous point in the impedance). Impedance is usually stated in ohms, abbreviated R. In engineering, impedance is abbreviated Z. See also resistance.

Total effective fence load. This is made up of Capacitance, Inductance and Resistance. In terms of the energizer, low impedance means low internal resistance of the energizer.

Electrical impedance or simply impedance is a measure of opposition to a sinusoidal electric current. The concept of electrical impedance generalizes Ohm's law to AC circuit analysis. Unlike electrical resistance, the impedance of an electric circuit can be a complex number. Oliver Heaviside coined the term impedance in July of 1886.

Total opposition to the current flow in an AC electrical circuit, which is equal to the square root of the sum of the squares of resistance and reaction in the circuit. The circuit voltage divided by the circuit impedance and the flow of current in an AC circuit are equal.

The complex form of resistance. It comprises the resistance, which is its real part, constant from DC, and the reactance, which is frequency dependent.

The total resistance and reactance offered by a component. The unit of impedance is the ohm and is specified with resistive and reactive values as a complex number. The common symbol for impedance is Z.

the electrical resistance of a system measured in Ohms. The impedance of microphones, auxiliary equipment and loudspeakers must be matched if they are to operate correctly.

A resistance measurement calibrated in “Ohms” which varies with frequency. The RF Connector selected must be the same impedance as the system in which it is used. For example, 50-Ohm connectors must be used with 50-Ohm cable while 75-Ohm connectors and 75-Ohm cable must also be used together.

The total resistive and reactive opposition to electrical flow.

The total resistance to flow of current, including both the AC and DC component. The DC component is simply the DC resistance of the winding. The AC component of the impedance includes the inductor reactance, which is written XL = 2Ï€Ã„L.

The impedance of an inductor is the total resistance to the flow of current, including the AC and DC component. The DC component of the impedance is simply the DC resistance of the winding. The AC component of the impedence includes the inductor reactance. The following formula calculates the inductive reactance of an ideal inductor (i.e. one with no losses) to a sinusoidal AC signal. (Z

the apparent opposition in an electrical circuit to the flow of an alternating current

A unit of electrical resistance. Generally expressed as high impedance (hi-Z) or low impedance (low-Z). The impedance of various pieces of interconnected video and audio equipment must match or else various types of distortion and inefficiency will result.

The effective resistance of an electronic circuit to an A.C. signal.

Resistance to alternating-current flow

The complete opposition offered by a circuit to the flow of current at a certain frequency that is a combination of resistance (R) and reactance (X). Impedance is measured in ohms; the quality of the conductor is better the lower the ohmic value.

The opposition to alternating current flow expressed in ohms and designated by the symbol Z.

The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It indicates the ideal transfer of signal from one piece of equipment to another. It is measured in ohms.

A measure of resistance to electrical current flow when a voltage is moved across something, such as a resistor. Impedance is measured in ohms, and is...

Total opposition to flow of an alternating current as a result of resistance and reactance. Related Terms: Grounding | Input Impedance | Resistor

A measure of an RF component's input and output “size” expressed in ohms. In RF systems, the standard size used by all components is 50 ohma.

(Z) Measured in ohms it is the total opposition to the flow of current offered by a circuit. Impedance consists of the vector sum of resistance and reactance.

The complex combination of resistance and reactance, measured in Ohms (50 typically). Impedance must be matched for maximum power transfer.

The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It is a combination of resistance R and reactance X, expressed in ohms and designated by Z.

In a DC (direct current) circuit, the same thing as resistance. In an AC (alternating current) circuit, impedance is the complex interaction of inductive and capacitive forces-in addition to resistance. In such a circuit, impedance is dependent upon frequency. See also Resistance; Input impedance; Output impedance.

This is the total opposition to the flow of electricity in a circuit, combining the effects of resistance, inductance and capacitance--measured in ohms.

Similar to resistance but applies to AC circuits. The opposition a component in a circuit offers to the flow of alternating current at a given frequency. If the frequency changes, the impedance changes too. Impedance is measured in ohms and has the symbol "Z" with unit ohm.

Measured in ohms, it is the total opposition to the flow of current offered by a circuit. It includes opposition caused by Inductance, Reactance and Resistance.

The electrical characteristic of a transmission circuit expressed in ohms. The transmission circuit (line) is usually terminated in a resistance such as 50 or 75 ohms (most popular).

A measure of electrical resistance measured in ohms. One characteristic of loudspeaker voice coils are impedance as measured in ohms.

Impedance is the opposition offered by a material to the flow of an electrical current and is a characteristic of AC systems. Impedance has two parts - resistance and reactance. Reactance has two components, capacitive reactance and inductive reactance. The properties of these last two components are dependent upon the frequency.

A measurement, in ohms, of the resistance a component presents to the flow of electrical current; the lower the number, the less resistance.

n. Symbol Z A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance. Impedance is measured in ohms.

Measured in ohms, impedance is the total opposition to current flow in a circuit where alternating current is flowing.

The opposition a circuit offers to the flow alternating of current. it includes resistance and reactance andis measured in ohms.

Impedance is a measure of electrical resistance specified in ohms. Speakers are commonly listed as 4 or 8 ohms but speakers are reactive devices and a nominal 8 ohm speaker might measure from below 4 ohms to 60 or more ohms over its frequency range. This varying impedance curve is different for each speaker model and makes it impossible to design a really effective "generic" speaker level high-pass filter. Active devices like amplifiers typically have an input impedance between about 10,000-100,000 ohms and the impedance is the same regardless of frequency.

The resistance at a certain frequency.

The AC resistance of a circuit expressed in ohms. Determined by the connector geometry and insulating material parameters. Impedance varies with Frequency. For optimum performance connector impedance must be the same as the system impedance.

Measured in ohms, this is a way of expressing a circuit's opposition (resistance and reactance) to a signal or current attempting to pass through. The practical difference between impedance and resistance is that impedance changes as a function of frequency.

Impedance is commonly listed from 4 to 8 ohms, with some ranging from 2 to 16 ohms. This is a technical description of the amount of inductive resistance a speaker offers to the flow of electrical signals from a receiver. Under normal circumstances, impedance bears no relation to sound quality, but many receivers need a minimum of 4 ohms to work properly. A good receiver may work with 2 ohms, but other receivers or amplifiers will automatically shut off or blow a fuse. If you intend to use two pairs of speakers in parallel from the same terminals, choose loudspeakers rated at least 8 ohms. Also note that speaker impedance ratings are nominal, meaning that a speaker may actually fall below its rated impedance at some frequencies.

A measure of resistance and reactance to the flow of electricity. Measured in Ohms.

The total opposition offered to alternating or pulsating current measured in ohms. Impedence is the vector sum of the resistive and reactive components of a capacitor expressed mathematically as

The opposition to an RF signal that causes part of that signal to be reflected back. The magnitude and phase angle of these reflections are determined by the characteristics of the input (or output) of the device being tested. Expressed in ohms.

A measurement of resistance of electrical energy passed through a conductor circuit.

The total opposition to electrical flow (resistive plus reactive).

The opposition of a component, such as a microphone or speaker, to the flow of current. Impedance is measured in ohms and is symbolized by the letter Z.

is the input and output characteristic of any electrical system and is measured in ohms. For maximum signal transfer, the input and output impedance should be the same. CCTV systems have a 75 ohm impedance.

A measurement of opposition to electrical current exhibited by a circuit or device, taking into account resistance and AC reactance

The opposition which a circuit or component offers to the flow of electric current. It is expressed in ohms and is equal to the ratio of the effective value of the voltage applied to the circuit to the resulting current flow. In A.C. circuits, the impedance is a complex quantity that includes both resistance and reactance. In D.C. circuits, it is purely resistive.

The resistance to the flow of an electrical charge in a circuit, measured in ohms.

Opposition or resistance to the flow of electrical current. The rated impedance of a loudspeaker is an average, since the impedance depends on the frequency of the signal.

The apparent opposition of current flow with application of voltage.

Resistance measured in an electrical circuit stated in Ohms.

The input or output characteristic of a system component that determines the type of transmission cable to be used. The cable used must have the same characteristic impedance as the component. Expressed in ohms. Video distribution has standardized on 75-ohm coaxial and 124-ohm balanced cable.

Total opposition to current flow, in ohms, of an electric circuit. Comprised of the copper loses associated with the resistance of the magnet wire and the inductive reactance losses associated with the changing magnetic and electric field losses. The summation of the resistive and reactive losses are done via vector addition.

(As it applies to filters): The resistive source and load terminations required to insure proper filter performance.

The resistive and reactive load that a speaker presents to the amplifier driving it.

Electrical characteristic of a system or component, expressed in ohms. CCTV industry has standardized 75-ohm impedance.

Resistance or opposition to the flow of electrical current. Measured in ohms During defibrillation the majority of the impedance comes from the chest wall and tissues.

A measure, in ohms, of the opposition to current flow in an ac circuit, including resistance and reactance.

The opposition to electrical flow in an alternating current electrical circuit.

The ratio of voltage to current in AC circuits, containing both resistance and reactance terms, usually expressed as ohms.

Apparent resistance of an alternating circuit to current; comprised of reactance and ohmic resistance. See Resistance.

The Ohmic value of an antenna feed point, matching section or transmission line at a radio frequency. An impedance may contain a reactance as well as a resistance component.

That the forces that resist the flow of current in AC circuits like resistance or inductive or capacitive reactance.

The total opposition a circuit, cable or component offers to alternating current. It includes both resistance and reactance and is generally expressed in ohms.

The combined effect of resistance, inductance and capacitance on a transmitted signal. Impedance varies at different frequencies.

The total resistance of an electrical circuit or component. It is expressed in ohms.

The total opposition to sinusoidal current expressed in ohms.

The opposition to the flow of alternating current (AC) in a circuit. Measured in ohms.

The total passive opposition offered to the flow of electric current. Determined by the particular combination of resistance, inductive reactance, and capacitive reactance in a given circuit. A function of frequency, except when in a purely resistive network.

The total opposition offered by a circuit or component to the flow of alternating current.

The resistance to the flow of an electric current in a circuit. This is effectively the electrical load that a loudspeaker presents to the amplifier which is driving it and is measured in ohms.

The opposition to power flow in an AC circuit. Also, any device that introduces such opposition in the form of resistance, reactance, or both. The impedance of a circuit or device is measured as the ratio of voltage to current, where a sinusoidal voltage and current of the same frequency are used for the measurement; it is measured in ohms.

An electrical property of a cable that combines capacitance, inductance, and resistance. Impedance can be described as the apparent resistance to the flow of alternating current at a given frequency; ... more

The total opposition in an electric circuit to the flow of an alternating current. Expressed in ohms.

The amount of resistance (or cost) required to traverse a line from its origin node to its destination node or to make a turn (i.e., move from one arc through a node onto another arc). Resistance may be a measure of travel distance, time, speed of travel times the length, and so on. Higher impedance indicates more resistance to movement, with 0 indicating no cost. Often, a negative impedance value indicates a barrier. Impedance is used in network routing and allocation. An optimum path in a network is the path of least resistance (or lowest impedance).

Resistance to the flow of AC current. In telecommunications and broadcast systems, the characteristic impedance is 75 ohms. If all cable and devices are equal to the characteristic impedance, maximum signal will be transferred with little or no reflection.

The resistance of a device to the flow of alternating current. Often used to rate the resistance of a speaker's voice coil.

The opposition in an electric circuit to the flow of electrical current at a given frequency. Impedance consists of resistance, inductive reactance, and capacitive reactance. It is measured in Ohms.

Opposition to the flow of alternating (AC) electric current. See Resistance.

The total opposition to an alternating current in an electric circuit. It is the joint effect of resistance, inductive reactance, and capacitive reactance. The symbol for impedance is "Z".

the resistance of a circuit to the flow of alternating current, measured in ohms. In audio, impedance is typically classified as low or high and often referred to as Lo-Z or Hi-Z

Electrical resistance to the flow of alternating current, measured in Ohms. - Category: Recording

A measure of the electrical property of resistance, expressed in ohms.

Impedance Balancing Import