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impedance    音标拼音: [ɪmp'idəns]
n. 阻抗

阻抗

impedance
阻抗

impedance
阻抗

impedance
n 1: a material's opposition to the flow of electric current;
measured in ohms [synonym: {electric resistance}, {electrical
resistance}, {impedance}, {resistance}, {resistivity},
{ohmic resistance}]

Impedance \Im*ped"ance\, n. [Impede -ance.] (Elec.)
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 root{R^{2}
X^{2}}, where R = ohmic resistance, X = reactance. For an
inductive circuit, X = 2[pi]fL, where f = frequency and L =
self-inductance; for a circuit with capacity X = 1 [div]
2[pi]fC, where C = capacity.
[Webster 1913 Suppl.]

18 Moby Thesaurus words for "impedance":
capacitive reactance, clog, cumbrance, electric resistance,
hindrance, impediment, inductive reactance, magnetic reluctance,
ohm, ohmage, reactance, reluctance, reluctivity, resistance,
skin effect, specific reluctance, surface resistance,
volume resistance


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  • Electrical impedance - Wikipedia
    In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit [1] Quantitatively, the impedance of a two-terminal circuit element is the ratio of the complex representation of the sinusoidal voltage between its terminals, to the complex representation of the current flowing through it [2] In general, it
  • What Is Impedance in an Electrical Circuit? - ScienceInsights
    Impedance is the total opposition to current flow in an alternating current (AC) circuit, measured in ohms (Ω) It combines two distinct effects: resistance, which opposes current regardless of conditions, and reactance, which opposes current only when the voltage or current is changing If you already understand resistance from basic DC circuits, impedance is its broader, more complete
  • Electrical impedance | Definition, Symbol, Units, Facts - Britannica
    Electrical impedance, measure of the total opposition that a circuit or a part of a circuit presents to electric current Impedance includes both resistance and reactance The resistance component arises from collisions of the current-carrying charged particles with the internal structure of the
  • Electrical Impedance: What is it? (Types Examples)
    What is Electrical Impedance? In electrical engineering, electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied Impedance extends the concept of resistance to alternating current (AC) circuits Impedance possesses both magnitude and phase, unlike resistance, which has only magnitude
  • What is Impedance? - Learning about Electronics
    Inductor Impedance To calculate the impedance of an inductor, the formula to do so is: where X L is the impedance in unit ohms, f is the frequency of the signal passing through the inductor, and L is the inductance of the inductor To use our online calculator that will calculate inductor impedance automatically for you, visit the resource
  • What is Impedance? AC Circuit Analysis and Design - Rohm
    Impedance Summary In this article, we examined impedance, a key quantity in AC circuit analysis Impedance represents the overall opposition to AC current flow in a circuit, combining resistance with the reactance of inductors and capacitors Because impedance is strongly affected by frequency, AC circuits require different treatment from DC
  • What is electrical impedance? | Definition from TechTarget
    Impedance, denoted as Z, is an expression of the opposition that an electronic component, circuit or system offers to alternating or direct electric current Impedance is a vector (two-dimensional) quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance When calculating the impedance, resistance represents the real part, while reactance is the
  • Impedance – how is it calculated and why is it important?
    Impedance is key in AC circuits: discover the differences between resistance and impedance and learn how to calculate equivalent impedance
  • Impedance - HyperPhysics
    Impedance is the measure of opposition to alternating current in electrical circuits, combining resistance, inductive reactance, and capacitive reactance
  • What is Impedance? - The Tech Circuit™
    What is Impedance Though? Impedance (Z) (also in OHMS) is the combination of all resistances and reactances in a circuit It can contain just resistance, just capacitive reactance, just inductive reactance, or any combination of the above





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