- 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.
- 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: the reciprocal of admittance: symbol, Z
- the ratio of the force per unit area to the volume displacement of a given surface across which sound is being transmitted
Origin of impedance; from imped(e) + -ance
- Symbol Z 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.
- An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.
(countable and uncountable, plural impedances)
- (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.
- (physics, usually with “mechanical”) a measure of opposition to motion of something subjected to a force.
- (physics, usually with “acoustic” or “sound”) the sound pressure divided by the particle velocity and the surface area through which an acoustic wave propagates.
- (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
impede + -ance
impedance - Computer Definition
(1) The opposition to the flow of alternating current in a circuit. Represented by the letter "Z" and measured in ohms, impedance is the combination of resistance, inductance and capacitance of the circuit. See ohm.
(2) The opposition that a speaker produces to the alternating current coming from an amplifier. The lower the impedance, the more power required. Most speakers have an impedance of four to eight ohms. See ohm.