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Related Concept Videos

Impedance Combination01:21

Impedance Combination

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Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage...
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Impedances and Admittance01:23

Impedances and Admittance

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In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
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Series Impedances: Three-Phase Line01:27

Series Impedances: Three-Phase Line

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Calculating series impedances for a three-phase overhead line involves evaluating resistances and inductive reactances in a network with three-phase and multiple neutral conductors grounded at regular intervals.
Using Kirchhoff's laws, an integro-differential equation for the network is derived. This equation accounts for unbalanced phase currents, which may induce return currents through neutral wires and the earth, seeking the least impedance path. Earth return conductors can replace the...
451
Bus Impedance Matrix01:24

Bus Impedance Matrix

539
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
539
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

463
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
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RLC Series Circuits: Impedance01:29

RLC Series Circuits: Impedance

2.6K
When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation
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Impedance spectroscopy.

J R Macdonald1

  • 1Department of Physics and Astronomy, University of North Carolina, Chapel Hill 27599-3255.

Annals of Biomedical Engineering
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Impedance spectroscopy (IS) measures a material's electrical response to understand its physicochemical properties. This technique, also known as immittance spectroscopy, analyzes data across various frequency domains.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Impedance spectroscopy (IS) is a versatile technique for characterizing materials.
  • It involves measuring the electrical response of a system under small AC signals.

Purpose of the Study:

  • To define impedance spectroscopy (IS) and its scope.
  • To highlight its application in determining physicochemical properties.

Main Methods:

  • Small-signal electrical measurements.
  • Frequency domain analysis (including time-domain to frequency-domain transformation).
  • Analysis across four basic immittance levels.

Main Results:

  • IS provides insights into material properties by analyzing electrical responses.
  • The technique is adaptable to various measurement domains (frequency and time).

Conclusions:

  • Impedance spectroscopy is a broad term encompassing immittance spectroscopy.
  • It is a powerful tool for physicochemical characterization.