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  2. Electrical impedance - Wikipedia

    en.wikipedia.org/wiki/Electrical_impedance

    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]

  3. Impedance parameters - Wikipedia

    en.wikipedia.org/wiki/Impedance_parameters

    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.

  4. Impedance matching - Wikipedia

    en.wikipedia.org/wiki/Impedance_matching

    In electrical engineering, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Often, the desired value is selected to maximize power transfer or minimize signal reflection .

  5. Input impedance - Wikipedia

    en.wikipedia.org/wiki/Input_impedance

    In electrical engineering, the input impedance of an electrical network is the measure of the opposition to current (), both static and dynamic (), into a load network or circuit that is external to the electrical source network.

  6. Impedance - Wikipedia

    en.wikipedia.org/wiki/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

  7. Electrical reactance - Wikipedia

    en.wikipedia.org/wiki/Electrical_reactance

    In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance. [1] Along with resistance, it is one of two elements of impedance; however, while both elements involve transfer of electrical energy, no dissipation of electrical energy as heat occurs in reactance; instead, the reactance stores energy until a quarter-cycle later when the energy ...

  8. Nominal impedance - Wikipedia

    en.wikipedia.org/wiki/Nominal_impedance

    In the field of radio frequency (RF) and microwave engineering, by far and away the most common transmission line standard is 50 Ω coaxial cable (coax), which is an unbalanced line. 50 Ω first arose as a nominal impedance during World War II work on radar and is a compromise between two requirements. This standard was the work of the wartime ...

  9. Glossary of electrical and electronics engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_electrical_and...

    power engineering That part of electrical engineering that deals with the generation, distribution and consumption of electrical power. power-factor correction Apparatus intended to bring the power factor of some load closer to 1. power factor The ratio of apparent power flowing to a load divided by the real power. power-flow study