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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Energy Stored in Capacitors01:10

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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Energy Stored in a Capacitor: Problem Solving01:26

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In 1749, Benjamin Franklin coined the word battery for a series of capacitors connected to store energy. Capacitors store electric potential energy that can be released over a short time. This property means capacitors have a wide range of applications.
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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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Leaking elastic capacitor as model for active matter.

Robert Alicki1, David Gelbwaser-Klimovsky2, Alejandro Jenkins1,3

  • 1International Centre for Theory of Quantum Technologies (ICTQT), University of Gdańsk, 80-308, Gdańsk, Poland.

Physical Review. E
|June 17, 2021
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Summary
This summary is machine-generated.

We introduce a new model, the leaking elastic capacitor (LEC), which can generate electricity autonomously. This electromechanical system exhibits self-oscillation and chaos, acting as an engine to pump current.

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Area of Science:

  • Physics
  • Chemistry
  • Biology

Background:

  • Active systems with electrical double layers are crucial in condensed matter physics, chemistry, and biology.
  • Existing models may not fully capture the complex dynamics of these systems.

Purpose of the Study:

  • Introduce the leaking elastic capacitor (LEC) model, a novel nonconservative dynamical system.
  • Investigate the electromechanical coupling and energy conversion capabilities of the LEC.

Main Methods:

  • Developed a theoretical model combining electrical and mechanical degrees of freedom.
  • Utilized numerical simulations to explore system dynamics, including bifurcations and chaotic regimes.
  • Analyzed the energy conversion processes and current pumping mechanisms.

Main Results:

  • Demonstrated that the LEC can undergo a Hopf bifurcation, leading to self-oscillation (limit cycle) or chaos.
  • Showed the LEC functions as an autonomous engine, performing work by converting electrical energy into mechanical motion.
  • Confirmed the ability of the LEC to generate an electromotive force and pump current irreversibly.
  • Identified potential for sustaining electromechanical waves.

Conclusions:

  • The LEC model provides a new, more realistic framework for understanding active systems with electrical double layers.
  • This model offers insights into autonomous energy conversion and electromechanical wave propagation.
  • The LEC has potential applications in condensed matter physics, chemistry, and biology.