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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...
445
Bus Impedance Matrix01:24

Bus Impedance Matrix

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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,...
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

454
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

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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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Related Experiment Video

Updated: Feb 4, 2026

Author Spotlight: Optimizing Porous Substrate Electroporation Through Micro and Nanochannels for Enhanced Monitoring and Intermediate Stage Characterization
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Label-Free Nanoparticle Characterization via Electrical Impedance-Based Submicrofluidic Analysis.

Qiang Zhao1, Ye Ai1

  • 1Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore.

Nano Letters
|February 2, 2026
PubMed
Summary
This summary is machine-generated.

A new impedance-based submicrofluidic analysis (ISMA) system offers label-free, high-resolution nanoscale particle measurement. This advanced system accurately characterizes nanoparticles and extracellular vesicles for biomedical research and nanodiagnostics.

Keywords:
Electrical impedance analysisExosome analysisMicrofluidicsNanofluidicsSingle nanoparticle characterization

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Analytical Chemistry

Background:

  • Accurate characterization of nanoparticles and extracellular vesicles is crucial for advancements in nanotechnology, biomedical research, and diagnostics.
  • Existing methods for nanoscale particle analysis often face limitations in resolution, accuracy, or require labeling.

Purpose of the Study:

  • To develop and validate a novel impedance-based submicrofluidic analysis (ISMA) system for label-free, high-resolution nanoscale particle measurement.
  • To demonstrate the system's capability in accurately sizing nanoparticles and characterizing extracellular vesicles.

Main Methods:

  • Integration of a submicrochannel with a double differential electrode configuration within the ISMA system.
  • Application of wavelet filtering to significantly reduce electrical noise and enhance signal clarity.
  • Validation using polystyrene nanoparticles and exosomes from MDA-MB-231 cells, with comparisons to scanning electron microscopy (SEM) and nanoparticle tracking analysis (NTA).

Main Results:

  • The ISMA system achieved a 50 nm detection limit for polystyrene nanoparticles, with results correlating closely with SEM measurements.
  • ISMA demonstrated superior measurement accuracy compared to nanoparticle tracking analysis (NTA).
  • The system successfully characterized exosomes and differentiated them from similar-sized synthetic particles in mixtures.

Conclusions:

  • The ISMA system provides a powerful and scalable platform for precise size and concentration analysis of nanoparticles and extracellular vesicles.
  • The developed technology holds significant potential for applications in biomedical research and nanodiagnostics.
  • Label-free, high-resolution nanoscale particle measurement is achievable with the presented ISMA system.