impedance ratio

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• Impedance matching — In electronics, impedance matching is the practice of designing the input impedance of an electrical load (or the output impedance of its corresponding signal source) to maximize the power transfer and/or minimize reflections from the load.… …   Wikipedia

• Impedance — is a concept associated with the transmission of waves and electrical signals. There are many kinds of waves, and impedance is different in each of them, hence this disambiguation page. However, impedance is also a unifying concept. It is related …   Wikipedia

• Impedance cardiography — (ICG) is a hemorheology technique of using sensors to detect the properties of the blood flow in the Thorax.IntroductionImpedance cardiography (ICG), also referred to as thoracic electrical bioimpedance (TEB) and electrical impedance… …   Wikipedia

• Impedance — Im*ped ance, n. [Impede + ance.] (Elec.) The apparent resistance in an electric circuit to the flow of an alternating current, analogous to the actual electrical resistance to a direct current, being the ratio of electromotive force to the… …   The Collaborative International Dictionary of English

• impedance — [im pēd′ ns] n. [< IMPED(E) + ANCE] 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… …   English World dictionary

• impedance — /im peed ns/, n. 1. Elect. 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 2. Also… …   Universalium

• Impedance —   The opposition to power flow in an AC circuit. Also, any device that introduces such opposition in the form of resistance, reactance, or both. The impedance of a circuit or device is measured as the ratio of voltage to current, where a… …   Energy terms

• impedance — noun Date: 1886 something that impedes ; hindrance: 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… …   New Collegiate Dictionary

• impedance — 1. Total opposition to flow. In electricity, when flow is steady, i. is simply the resistance, e.g., the driving pressure per unit flow; when flow is changing, i. also includes the factors that oppose changes in flow. Thus, deviations of i., from …   Medical dictionary

• impedance — im•ped•ance [[t]ɪmˈpid ns[/t]] n. 1) elm 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 usu. expressed in ohms 2) phs the… …   From formal English to slang

• Electrical impedance — Electromagnetism Electricity · …   Wikipedia