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Related Concept Videos

Equivalent Capacitance01:19

Equivalent Capacitance

From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
Equivalent Capacitance01:19

Equivalent Capacitance

Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
Equivalent Resistance01:16

Equivalent Resistance

In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Ionic Bonds00:42

Ionic Bonds

When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...
Ionic Bonds00:42

Ionic Bonds

When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.Opposing Charges Hold Ions Together in Ionic CompoundsIonic bonds are reversible electrostatic interactions between ions with...

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Related Experiment Video

Updated: Jun 23, 2026

Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises
13:56

Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises

Published on: January 18, 2011

Equivalent Circuits as Related to Ionic Systems.

A Finkelstein, A Mauro

    Biophysical Journal
    |May 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study clarifies equivalent circuits for membranes using Nernst-Planck equations. Two circuits are derived: one for all electrical properties, and another for steady-state behavior, highlighting potential misinterpretations for homogeneous membranes.

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    Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises
    13:56

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    Published on: January 18, 2011

    Electric Cell-substrate Impedance Sensing for the Quantification of Endothelial Proliferation, Barrier Function, and Motility
    12:30

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    08:06

    Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

    Published on: February 23, 2017

    Area of Science:

    • Membrane biophysics
    • Electrophysiology
    • Physical chemistry

    Background:

    • Equivalent circuits are widely used to model membrane electrical properties.
    • The relationship between fundamental flux equations and these circuits requires clarification.

    Purpose of the Study:

    • To elucidate the connection between Nernst and Planck flux equations and equivalent electrical circuits.
    • To differentiate the applicability and interpretation of derived equivalent circuits for homogeneous membranes.

    Main Methods:

    • Algebraic derivation of equivalent circuits directly from Nernst and Planck flux equations.
    • Analysis of the predictive capabilities of each circuit type for steady and transient states.

    Main Results:

    • Two types of equivalent circuits were derived: a "pure electrical equivalent circuit" and a "mixed equivalent circuit."
    • The pure electrical circuit accurately predicts all electrical properties (steady and transient).
    • The mixed circuit predicts steady-state characteristics but can be misleading for homogeneous membranes, though accurate for mosaic membranes.

    Conclusions:

    • The pure electrical equivalent circuit is recommended for accurately modeling homogeneous membrane electrical properties.
    • The mixed equivalent circuit's limitations for homogeneous membranes are highlighted, despite its utility for mosaic membranes.
    • This analysis aims to aid electrophysiologists in the precise use of equivalent circuit terminology for plasma membrane behavior.