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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

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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.
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Series Impedances: Three-Phase Line01:27

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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.
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Bus Impedance Matrix01:24

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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.
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Line Protection with Impedance Relays01:27

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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.
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RLC Series Circuits: Impedance01:29

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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.
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Video Experimental Relacionado

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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Caracterización de nanopartículas sin etiquetas mediante análisis submicrofluídico basado en impedancia eléctrica

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
Resumen

Un nuevo sistema de análisis submicrofluídico basado en impedancia (ISMA) ofrece medición de nanopartículas sin etiquetas y de alta resolución. Este sistema avanzado caracteriza con precisión nanopartículas y vesículas extracelulares para la investigación biomédica y el diagnóstico de nano.

Palabras clave:
Análisis de impedancia eléctricaAnálisis de exosomasMicrofluídicaNanofluídicaCaracterización de nanopartículas individuales

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Área de la Ciencia:

  • Nanotecnología
  • Ingeniería Biomédica
  • Química Analítica

Sus antecedentes:

  • La caracterización precisa de nanopartículas y vesículas extracelulares es crucial para los avances en nanotecnología, investigación biomédica y diagnóstico.
  • Los métodos existentes para el análisis de nanopartículas a nanoescala a menudo enfrentan limitaciones en resolución, precisión o requieren etiquetado.

Objetivo del estudio:

  • Desarrollar y validar un novedoso sistema de análisis submicrofluídico basado en impedancia (ISMA) para la medición de nanopartículas sin etiquetas y de alta resolución.
  • Demostrar la capacidad del sistema para medir con precisión el tamaño de nanopartículas y caracterizar vesículas extracelulares.

Principales métodos:

  • Integración de un submicrocanal con una configuración de electrodo diferencial doble dentro del sistema ISMA.
  • Aplicación de filtrado de wavelet para reducir significativamente el ruido eléctrico y mejorar la claridad de la señal.
  • Validación utilizando nanopartículas de poliestireno y exosomas de células MDA-MB-231, con comparaciones con microscopía electrónica de barrido (SEM) y análisis de seguimiento de nanopartículas (NTA).

Principales resultados:

  • El sistema ISMA logró un límite de detección de 50 nm para nanopartículas de poliestireno, con resultados que se correlacionaron estrechamente con las mediciones de SEM.
  • ISMA demostró una precisión de medición superior en comparación con el análisis de seguimiento de nanopartículas (NTA).
  • El sistema caracterizó con éxito exosomas y los diferenció de partículas sintéticas de tamaño similar en mezclas.

Conclusiones:

  • El sistema ISMA proporciona una plataforma potente y escalable para el análisis preciso de tamaño y concentración de nanopartículas y vesículas extracelulares.
  • La tecnología desarrollada tiene un potencial significativo para aplicaciones en investigación biomédica y nanodiagnóstico.
  • La medición de nanopartículas sin etiquetas y de alta resolución es factible con el sistema ISMA presentado.