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Related Concept Videos

Electromotive Force01:02

Electromotive Force

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Electromotive force (emf) is the force that causes current to flow from a higher to a lower  potential. The term "electromotive force" is used for historical reasons, even though emf is not a force at all.
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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Finite Element Modelling of a Cellular Electric Microenvironment
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Dynamical theory for the battery's electromotive force.

Robert Alicki1, David Gelbwaser-Klimovsky, Alejandro Jenkins

  • 1International Centre for Theory of Quantum Technologies (ICTQT), University of Gdańsk, 80-308, Gdańsk, Poland. robert.alicki@ug.edu.pl.

Physical Chemistry Chemical Physics : PCCP
|April 22, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a dynamical theory explaining how battery chemical energy creates electromotive force (emf). A self-oscillating double layer at the electrode-electrolyte interface converts chemical energy into electrical work, powering the emf.

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Area of Science:

  • Electrochemistry
  • Chemical Thermodynamics
  • Physical Chemistry

Background:

  • Batteries store chemical energy converted to electrical energy.
  • Electromotive force (emf) is a key battery characteristic.
  • The precise mechanism of emf generation from chemical energy is not fully understood.

Purpose of the Study:

  • To propose a dynamical theory for electromotive force (emf) generation in batteries.
  • To elucidate the role of the electrode-electrolyte interface in energy conversion.
  • To connect theoretical predictions with experimental observations in electrochemical cells.

Main Methods:

  • Development of a dynamical theory for emf generation.
  • Analysis of the double layer at the electrode-electrolyte interface.
  • Modeling of self-oscillation phenomena in electrochemical systems.

Main Results:

  • The battery's half-cell functions as an engine, extracting work from chemical disequilibrium.
  • A self-oscillating double layer pumps electric current, converting chemical to electrical energy.
  • This mechanism accounts for energy conversion equal to emf times separated charge.

Conclusions:

  • The proposed dynamical theory provides a new framework for understanding emf generation.
  • The double layer's self-oscillation is a potential mechanism for persistent energy conversion.
  • Further experimental validation is proposed to test the theory's predictions.