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Impedance is the measurement of resistance that a circuit gives to current, which flows due to applied voltage. Impedance refers to the ratio of voltage to current and app…licable to a circuit with alternating current. (MORE)

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If you pretend that the signals in electric circuits are of the form A*exp(s*t), where A and s are constants, and t is time, then derivatives of the signal and integrations of… the signal are always just a scaled version of the signal. So, the ratio of voltage to current, when the signals are of this form, is just a (possibly complex) constant. This number is called impedance, and it depends on the value of the constant "s" in the signal. Impedance is a term used to signify a device that react to the flow of electrons in a negative way. It can be of complex passive devices or active devices. Impedance (symbol: Z), expressed in ohms, is the opposition to the flow of alternating current by a resistive-reactive load. It is the vector sum of resistance and reactance. (MORE)

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Look at "Different names for the two impedances Z1 and Z2": Scroll down to related links and look at "Calculation the damping of impedance bridging or power matching an inter…face connecting Zout and Zin". Scroll down to related links and look at "Measurement of input impedance and output impedance". (MORE)

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For instance: A microphone rated at 150 ohms to 300 ohms is considered low impedance. About 600 to 2 000 ohms is medium impedance, and 10 000 ohms or more is hi…gh impedance. (MORE)

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Impedance is the complex form of resistance. Impedance takes into account capacitance and inductance in a circuit as well. Impedance can be represented as resistance as a func…tion of frequency. See link. Answer Impedance is not a 'complex form of resistance'. It is the vector sum of a circuit's resistance and reactance. In electrical engineering, 'resistance' has a very specific meaning, and cannot be used to denote 'opposition'. (MORE)

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Never heard the word "impedence". To get all the audio voltage from a source to a target without loss you need voltage bridging, that is a relative low output impedanc…e to a higher input impedance. Usualy the input impedance is at least ten times higher then the output impedance. An input impedance is called also a load impedance or an external impedance. An output impedance is called also a source impedance or an internal impedance. (MORE)

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Impedes is the present tense form of the verb impede. Impede means: - To retard or obstruct the progress of - To interfere with the progress of - T…o stop or prevent passage of (MORE)

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Impedance relays are used whenever over-current relays do not provide adequate protection. They function even if the short circuit current is relatively low. The speed of oper…ation is independent of current magnitude. Impedance relays monitor the impedance between the relay location and the fault. If the impedance falls within the relay setting, the relay will operate. The basic construction for impedance relays on which the principle of operation is easily explained is the balanced beam. (MORE)

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The official definition for the word impedance is " the effective resistance of an electric circuit or component to alternating current, arising from the combined effects …of ohmic resistance and reactance." (MORE)

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Impedance is the effective resistance of an electric current to the alternating current that arises from the combined effects of ohmic reactance and resistance.