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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
  • 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? 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
  • Impedance - MIT
    Impedance A circuit or components impedance is how much it opposes an alternating current It is roughly analogous to resistance in a D C circuit Impedance is the ratio of voltage amplitude to current amplitude: Z = V 0 I 0 Z = I 0V 0
  • Impedance and Complex AC Impedance - Basic Electronics Tutorials and . . .
    Electronics Tutorial about Impedance and Complex Impedance of an alternating AC circuit which contains inductance, capacitance and resistance in series or parallel
  • 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
  • Impedance- Definition, Symbol, Unit, Formula - Electrical Volt
    Definition of Impedance In AC electric circuits, the impedance is defined as the total electrical opposition offered by the circuit elements to the flow of alternating current through the circuit The impedance is frequency-dependent because the reactance of the inductor and capacitor varies with a change in the frequency The reactance of the inductor is inversely proportional to the
  • Impedance and Reactance - Electronics Club
    Impedance (symbol Z) is a measure of the overall opposition of a circuit to current, in other words: how much the circuit impedes the flow of charge It is like resistance, but it also takes into account the effects of capacitance and inductance Impedance is measured in ohms (Ω) Impedance is more complex than resistance because the effects of capacitance and inductance vary with the
  • What Is Impedance: Formula, Resistance, Reactance In AC
    Impedance Compared to Resistance What is impedance compared to resistance becomes clear when frequency and phase are considered Resistance is a real quantity that represents opposition to current without regard to frequency or timing Impedance includes both resistance and reactance, making it the correct measure of opposition in AC circuits
  • Impedance - Wikipedia
    Impedance is the complex-valued generalization of resistance It may refer to: Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium Electrical impedance, the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit





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