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 ohms
Symbol: Z
2.
a component that offers impedance
3. 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 wave
Symbol: Za
4. Also called: mechanical impedance
the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibration
Symbol: Zm
impedance in American English
(ɪmˈpidəns)
noun
1.
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
2.
the ratio of the force per unit area to the volume displacement of a given surface across which sound is being transmitted
Word origin
< impede + -ance
impedance in Electrical Engineering
(ɪmpidəns)
noun
(Electrical engineering: Circuits, Electrical power, Computing and control)
Impedance is a measure of the opposition to electrical flow, that is measured in ohms.
The symbol Z is used for impedance.
If you are running two 16 ohm speaker cabinets in parallel, you must set or use anamplifier and attenuator with an impedance value of 8 ohms.
The primary winding is designed to have very low impedance, and hence has negligible effect on the main current.
Impedance is a measure of the opposition to electrical flow, that is measured in ohms.
Examples of 'impedance' in a sentence
impedance
He diverted himself momentarily with the calculation of the total impedance of a certain circuit.