impedance

noun
im·​ped·​ance | \ im-ˈpē-dᵊn(t)s How to pronounce impedance (audio) \

Definition of impedance

: something that impedes : hindrance: such as
a : the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current
b : the ratio of the pressure to the volume displacement at a given surface in a sound-transmitting medium

Examples of impedance in a Sentence

Recent Examples on the Web Nominal impedance is 6 Ohms, minimally dipping to 4 Ohms. Robert Ross, Robb Report, 21 July 2021 Additionally, like its pricer counterparts, this scale has a safe mode that will disable the electrical current needed to determine BIA (bioelectrical impedance analysis), something that’s recommended for those with pacemakers or who are pregnant. Kara Cuzzone, Forbes, 4 June 2021 The low-impedance electrodes are six to 10 square millimeters in area and deliver up to 10 milliamperes of electric current between adjacent electrodes—enough to modulate the excitability of a million or more nerve cells. Christof Koch, Scientific American, 10 May 2021 Giles stated the impedance, or type of electrical resistance for alternating currents (what supplies power to household outlets), could be changed if a wire is bent many times. Miriam Fauzia, USA TODAY, 6 Apr. 2021 The amplifier has sufficient power to drive a variety of high-impedance headphones with a 2Vrms output level. Mark Sparrow, Forbes, 18 Mar. 2021 Around the back of the unit are a single pair of speaker binding posts and the Cyrus One Cast automatically adjusts its output to the speakers’ impedance. Mark Sparrow, Forbes, 1 Mar. 2021 That impedance is measured and calculated to provide the user with a wide range of body data. Allen Foster, chicagotribune.com, 19 Dec. 2020 Using bioelectric impedance analysis (BIA), this smart scale offers you nine precise ways to look into your body measurements, including weight, body fat, water, muscle mass, BMI, BMR, visceral fat, bone mass, and protein. Popular Science, 12 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impedance.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of impedance

1886, in the meaning defined above

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Time Traveler for impedance

Time Traveler

The first known use of impedance was in 1886

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Dictionary Entries Near impedance

impecunity

impedance

impedance bond

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Statistics for impedance

Last Updated

2 Aug 2021

Cite this Entry

“Impedance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impedance. Accessed 21 Sep. 2021.

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More Definitions for impedance

impedance

noun
im·​ped·​ance | \ im-ˈpēd-ᵊn(t)s How to pronounce impedance (audio) \

Medical Definition of impedance

1 : the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current
2 : the ratio of the pressure to the volume displacement at a given surface in a sound-transmitting medium
3 : opposition to blood flow in the circulatory system

More from Merriam-Webster on impedance

Britannica.com: Encyclopedia article about impedance

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