- Electricity. the total opposition to alternating current by an electric circuit, equal to the square root of the sum of the squares of the resistance and reactance of the circuit and usually expressed in ohms. Symbol: Z
- Also called mechanical impedance. Physics. the ratio of the force on a system undergoing simple harmonic motion to the velocity of the particles in the system.
- something that impedes; an obstacle or hindrance.
Origin of impedance
Related Words for impedanceintransigence, support, refusal, fight, protection, struggle, defiance, battle, discontent, disharmony, discord, hostility, antagonism, resistance, dissension, resentment, trouble, strife, hassle, animosity
Examples from the Web for impedance
Historical Examples of impedance
What is the impedance if the voltage of the line is 115 volts?
Impedance, however, does not equal the sum of resistance and reactance.
The impedance of its secondary will be a quarter of this or 3,000 ohms.Letters of a Radio-Engineer to His Son
The impedance of the coil I is changed by moving its adjustable core.Cyclopedia of Telephony and Telegraphy, Vol. 2
Impedance depends chiefly upon the frequency of alternation.The Library of Work and Play: Electricity and Its Everyday Uses
John F. Woodhull
- a measure of the opposition to the flow of an alternating current equal to the square root of the sum of the squares of the resistance and the reactance, expressed in ohmsSymbol: Z
- a component that offers impedance
- Also called: acoustic impedance the ratio of the sound pressure in a medium to the rate of alternating flow of the medium through a specified surface due to the sound waveSymbol: Z a
- Also called: mechanical impedance the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibrationSymbol: Z m
- 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. See also impedance matching.