# Impedance definition

ĭm-pēdns
The total opposition offered by an electric circuit to the flow of an alternating current of a single frequency: it is a combination of resistance and reactance and is measured in ohms.
noun
A measure of the opposition to the flow of alternating current through a circuit. Impedance is measured in ohms. The resistance of a circuit to direct current (also measured in ohms) is generally not the same as its impedance, due to the effects of capacitance and induction in and among the components of the circuit.
An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.
noun
The ratio of the force per unit area to the volume displacement of a given surface across which sound is being transmitted.
noun
(by analogy, software engineering, usually with “mismatch”) A measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases.
noun
The definition of an impedance is any obstruction, or the measure of the opposition of an electric current to the energy flow when voltage is applied.

An example of impedance is when a school marching band cannot participate in a parade because they can't affort the cost of gas for the bus.

An example of impedance is a line of resistance within an electrical current.

noun
The total passive opposition offered by a circuit to the flow of an alternating electric current (AC), impedance is a combination of resistance, inductive reactance, and capacitive reactance. See also AC, capacitance, inductance, and resistance.
(physics) 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
(physics, usually with “mechanical”) A measure of opposition to motion of something subjected to a force.
noun
(physics, usually with “acoustic” or “sound”) The sound pressure divided by the particle velocity and the surface area through which an acoustic wave propagates.
noun
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

Singular:
impedance
Plural:
impedances

## Origin of impedance

• impede +‎ -ance