what does the term impedance mean
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impedance Impedance, denoted Z, is an expression of the opposition that an electronic component, circuit, or system offers to alternating and/or direct electric current.Impedance is a vector (two-dimensional)quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance.
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Cable impedance Cable impedance. This document tries to clear out some details of transmission lines and cable inductance. This document is only a brief introduction to those topics. If you expect to work much with transmission lines, coaxial or otherwise, then it will be worth your while to get a book on that subject.
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- Impedance Z is measured in Ohms, same as resistance. The only difference is that this form of resistance is frequency dependent where induction or capacitances are involved. … Z = sqr(R2+X2) and in its complex from Z = R +jX where j = sqr(-1).
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What is electrical impedance? Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied. In quantitative terms, it is the complex ratio of the voltage to the current in an alternating current (AC) circuit. Impedance extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude.
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- A siemens is a unit of conductance or admittance, expressed as the reciprocal of resistance or impedance. (Siemens = 1/ohms). One microsiemens is 1 megohm. siemens is a unit of conductance or admittance, expressed as the reciprocal of resistance or impedance. (Siemens = 1/ohms). One microsiemens is 1 megohm.
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- Explain. Possible answer: If both equations share a common term, use the elimination method. If one equation has a variable isolated on one side, use the substitution method to substitute the expression for the isolated variable into the other equation.
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impedance : something that impedes : hindrance: such asa : the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective currentb : the ratio of the pressure to the volume displacement at a ...
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impedance The definition of an impedance is any obstruction, or the measure of the opposition of an electric current to the energy flow when voltage is applied. 1  An example of impedance is when a school marching band cannot participate in a parade because they can't affort the cost of gas for the bus. An example of impedance is a line of resistance within an electrical current. 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: the reciprocal of admittance: symbol, Z.
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Lessons In Electric Circuits -- Volume II In a circuit with a “long” line, the line's own characteristic impedance dominates circuit behavior. The ultimate example of this is a transmission line of infinite length: since the signal will never reach the load impedance, the source only “sees” the cable's characteristic impedance.
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What is Impedance, Anyway? The impedance of the load is expressed in ohms, and the relationship between the current and the voltage in the circuit is controlled by the impedances in the circuit.
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Electrical impedance The impedance of a circuit element can be defined as the ratio of the phasor voltage across the element to the phasor current through the element, as determined by the relative amplitudes and phases of the voltage and current.
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What does a network impedance analyzer do, and how does it work? In short, an electrical network impedance analyzer determines the total impedance (Z) (Complex), or complete opposition a circuit has to the flow of AC, where Z=R+jX (rectangular expression). R is the Real axis, +j is an imaginary number or axis and X is a coordinate.
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Electrical impedance Electrical impedance. An AC supply applying a voltage V {\displaystyle \scriptstyle V} , across an impedance Z {\displaystyle \scriptstyle Z} , driving a current I {\displaystyle \scriptstyle I} . Electrical impedance is the amount of opposition that a circuit presents to current or voltage change. The two main ways to write an impedance are: (see the 2nd figure, complex impedance plane) with the resistance R (real part) and the reactance X (imaginary part), for example Z = 1 + 1 j {\displaystyle Z=1+1j}.
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- Impedance (symbol: Z), expressed in ohms, is the opposition to the flow of alternating current by a resistive-reactive load. It is the vector sum of resistance and reactance. 8 people found this useful.
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- Asked by: Venudhar. Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat.
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Electrical impedance Electrical impedance. Electromagnetism. Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied. The term complex impedance may be used interchangeably. Quantitatively, the impedance of a two-terminal circuit element is the ratio of the complex representation of a sinusoidal voltage between its terminals to the complex representation of the current flowing through it..
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resistance 3. (Units). a. the opposition to a flow of electric current through a circuit component, medium, or substance. It is the magnitude of the real part of the impedance and is measured in ohms. Symbol: R Compare reactance 1. b. (as modifier): resistance coupling; a resistance thermometer. 4. (General Physics) any force that tends to retard or oppose motion: air resistance; wind resistance.
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Ohms & Impedences Explained OHMS are a way of measuring Resistance. Resistance is the measurement of an electrical device or circuits ability to flow electricity. Low resistance means the device is able to pass more electricity, high resistance means it passes less. Resistance is a Static measurement (it does not change).
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Bioelectrical impedance analysis Bioelectrical impedance analysis is a commonly used method for estimating body composition, and in particular body fat. Since the advent of the first commercially available devices in the mid-1980s the method has become popular owing to its ease of use, portability of the equipment. It is familiar in the consumer market as a simple instrument for estimating body fat. BIA actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can
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Bioelectrical Impedance Analysis (BIA) This resistance of the fat tissue to the current is termed 'bioelectrical impedance', and is accurately measured by body fat scales. When set against a person's height, gender and weight, the scales can then compute their body fat percentage.ody fat scales use the Bioelectrical Impedance Analysis (BIA) technique. This method measures body composition by sending a low, safe electrical current through the body.
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impedance noun. 1  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.
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- impedance is a measure of how much of the electrical signal can pass through a cable at any given time. Impedance of a cable is affected by the type and size of conductors used in a cable, the spacing and. orientation of the component cables, and the insulation surrounding the conductors. When designing a CCTV video surveillance system, it is extremely important to match the impedance of. the source, cabling and load.
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What is electrical impedance? , #5340000. Electrical impedance is the complex ratio of the voltage to the current in an alternating current (AC) circuit. Impedance extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude.
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- You can think of impedance as a more generalized version of resistance. It's useful for working with systems where we have to look at how a circuit's performance changes with time. We represent impedance as a complex number, where the real part is plain old resistance. The imaginary part is called reactance. You'll see speakers and headphones specified by impedance -- a common value is 8 ohms. Now, if you hook up an ohmmeter to your speaker leads, you won't get 8 ohms.
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Impedance cardiography ICG measures the corresponding change in impedance and its timing. ICG attributes the changes in impedance to (a) the volumetric expansion of the aorta (this is the main difference between ICG and Electrical Cardiometry) and (b) to the blood velocity-caused alignment of erythrocytes as a function of blood velocity.
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Microphone In passive microphones, this value describes the electrical resistance of the magnet coil (or similar mechanism). In active microphones, this value describes the output resistance of the amplifier circuitry. Typically, the rated impedance is stated.[45] Low impedance is considered under 600 ω.