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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
    Impedance extends the concept of resistance to alternating current (AC) circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude Impedance can be represented as a complex number, with the same units as resistance, for which the SI unit is the ohm (Ω)
  • Electrical Impedance: What is it? (Types Examples)
    This page is about the impedance of an electrical circuit The page shows the basic definition of impedance, physical significance of impedances and representation of different forms of impedance, including impedances of series and parallel RL, RC and RLC circuits
  • What is Impedance? - Learning about Electronics
    Impedance is the amount of resistance that a component offers to current flow in a circuit at a specific frequency In this article, we'll talk about how impedance is similar to and how it differs from just plain resistance
  • What Is Electrical Impedance and How Does It Work?
    Impedance is a combination of two components: resistance and reactance, and it is measured in ohms ($\Omega$) Unlike fixed resistance, impedance depends on the frequency of the AC signal passing through the circuit
  • 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
  • Impedance and Complex AC Impedance - Basic Electronics Tutorials and . . .
    Impedance is a value given in Ohms that is the combined effect of the circuits current limiting components within it, such as Resistance (R), Inductance (L), and Capacitance (C)
  • What Is Impedance? AC Circuit Resistance And Reactance
    Unlike simple resistance, impedance accounts for both resistance and reactance, which arise from inductance and capacitance in a circuit Because reactance depends on frequency, impedance determines how voltage, current, and power behave as operating conditions change
  • What is Impedance? AC Circuit Analysis and Design - Rohm
    In an AC circuit, impedance is defined as the ratio of the voltage across a circuit element to the current flowing through that element The critical point here is that, unlike a simple resistance, impedance has frequency-dependent characteristics A resistor dissipates energy as heat
  • Impedance in AC Circuits - GeeksforGeeks
    Impedance is the pure Ohmic resistance of a circuit and is a complex number consisting only of a real part being the actual AC resistance value, ( R ), and a zero imaginary part, ( 0j ) Thus, Ohm’s Law can be used in circuits containing an AC resistance to calculate these voltages and currents
  • What is impedance? - Magnetism
    Impedance (Z) is a complex value composed of two parts: resistance (R) and reactance (X) Resistance represents the opposition to current flow in a conductor, while reactance describes the opposition due to capacitive or inductive effects in a circuit





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