Impedance

What do we mean by impedance?

A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance. noun

An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission. noun

Hindrance; specifically, in electricity, an apparent increase of resistance due to induction in a circuit. noun

Impedance is the apparent resistance of an alternating-current circuit, or the ratio of the electromotive force consumed by an alternating current, divided by the current. On account of the electromotive force consumed by self-induction, the apparent resistance with alternating currents is greater than that with direct currents, though the power-consumption is the same. The impedance consists of two components—resistance, which consumes power, and reactance, which is the wattless resistance due to self-induction. See resistance, 3, and reactance. 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 = 2πfL, where f = frequency and L = self-inductance; for a circuit with capacity X = 1 ÷ 2πfC, where C = capacity. noun

A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, inductive and capacitive reactance. Represented by the symbol Z. noun

A measure of opposition to motion of something subjected to a force. noun

The sound pressure divided by the particle velocity and the surface area through which an acoustic wave propagates. noun

A measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases noun

A material's opposition to the flow of electric current; measured in ohms noun

The act of impeding; that which impedes; a hindrance.

A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, and inductive and capacitive reactances; the ratio of voltage to current treated as complex quantities.

A quantity analogous to electrical impedance in some other energy domain

(by analogy, usually with “mismatch”) a measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases

Words that are spelled similarly to impedance:
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Words that rhyme with impedance:
credence.

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Nouns that are often described by the adjective impedance:
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Words that sound like impedance:
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