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Qu'est-ce (qui) est impédance - définition

WIKIMEDIA DISAMBIGUATION PAGE

Impedence; Impedance (disambiguation)

Electrical impedance

$The phase angles in the equations for the impedance of capacitors and inductors indicate that the voltage across a capacitor ''lags'' the current through it by a phase of <math>\pi/2</math>, while the voltage across an inductor ''leads'' the current through it by <math>\pi/2</math>. The identical voltage and current amplitudes indicate that the magnitude of the impedance is equal to one.$

QUOTIENT OF THE VOLTAGE PHASOR AND THE ELECTRIC CURRENT PHASOR

Impedances; Electric impedance; Complex electric impedance; Electric effective resistance; Complex impedance; Conductor impedance; Electric complex impedance; Impedance of different devices (derivations); Deriving capacitor impedance; Complex Impedance; Phasor impedance; Electrical impedence; Capacitor impedance; Inductor impedance; Resistor impedance; Complex impedence; Impedance (electrical); Inductive impedance

In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.Slurzberg; Osterheld (1950).

https://en.wikipedia.org/wiki/Electrical_impedance

impedance

<electronics, physics> Opposition to flow of alternating current. Impedance consists of resistance plus reactance (capacitive or inductive). Measured in Ohms. (2003-12-02)

Impedance

·add. ·noun 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 = 2/fL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 / 2/fC, where C = capacity.

Wikipédia

Impedance

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
- High impedance, when only a small amount of current is allowed through
- Characteristic impedance of a transmission line
- Impedance (accelerator physics), a characterization of the self interaction of a charged particle beam
- Nominal impedance, approximate designed impedance
- Impedance matching, the adjustment of input impedance and output impedance
Mechanical impedance, a measure of opposition to motion of a structure subjected to a force
Wave impedance, a constant related to electromagnetic wave propagation in a medium
- Impedance of free space, a universal constant and the simplest case of a wave impedance

https://en.wikipedia.org/wiki/Impedance