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Cosa (chi) è impedance$37829$ - definizione

CONSTANT RELATED TO ELECTROMAGNETIC WAVE PROPAGATION IN A MEDIUM

Wave Impedance; Intrinsic impedance; Electromagnetic impedance

$To avoid reflections, the impedance of two media must match. On the other hand, even if the real part of the refractive index is the same, but one has a large absorption coefficient, the impedance mismatch will make the interface highly reflective.$

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 parameters

PARAMETERS TO DESCRIBE BEHAVIOUR OF ANY LINEAR ELECTRICAL NETWORK WITH A NUMBER OF PORTS

Z-parameters; Z parameters; Impedance matrix; Z-parameter

Impedance parameters or Z-parameters (the elements of an impedance matrix or Z-matrix) are properties used in electrical engineering, electronic engineering, and communication systems engineering to describe the electrical behavior of linear electrical networks. They are also used to describe the small-signal (linearized) response of non-linear networks.

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

Wave impedance

The wave impedance of an electromagnetic wave is the ratio of the transverse components of the electric and magnetic fields (the transverse components being those at right angles to the direction of propagation). For a transverse-electric-magnetic (TEM) plane wave traveling through a homogeneous medium, the wave impedance is everywhere equal to the intrinsic impedance of the medium.

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

Wikipedia

Wave impedance

The wave impedance of an electromagnetic wave is the ratio of the transverse components of the electric and magnetic fields (the transverse components being those at right angles to the direction of propagation). For a transverse-electric-magnetic (TEM) plane wave traveling through a homogeneous medium, the wave impedance is everywhere equal to the intrinsic impedance of the medium. In particular, for a plane wave travelling through empty space, the wave impedance is equal to the impedance of free space. The symbol Z is used to represent it and it is expressed in units of ohms. The symbol η (eta) may be used instead of Z for wave impedance to avoid confusion with electrical impedance.

https://en.wikipedia.org/wiki/Wave impedance