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Related Concept Videos

Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
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Electric Potential Energy in a Uniform Electric Field01:09

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When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
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Dimensional Analysis03:40

Dimensional Analysis

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Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
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Potential Energy00:52

Potential Energy

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The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy.
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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Related Experiment Video

Updated: Feb 8, 2026

Multifocal Electroretinograms
16:49

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Published on: December 4, 2011

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Three-Dimensional Model of Electroretinogram Field Potentials in the Rat Eye.

Ashley N Selner, Zahra Derafshi, Brian E Kunzer

    IEEE Transactions on Bio-Medical Engineering
    |July 12, 2018
    PubMed
    Summary

    A new bioelectric field model accurately simulates electroretinogram (ERG) potentials in rat eyes. This validated model enhances understanding of retinal function and aids in mapping retinal dysfunction using multi-electrode ERG (meERG).

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    Area of Science:

    • Ophthalmology
    • Bioengineering
    • Computational Biology

    Background:

    • The electroretinogram (ERG) provides valuable information about retinal function.
    • Understanding the relationship between retinal current sources and corneal potentials is key to enhancing ERG analysis for local dysfunction or therapeutic effects.

    Purpose of the Study:

    • To develop a robust bioelectric field model of the ERG.
    • To simulate ERG potentials at the cornea based on physiological retinal currents.

    Main Methods:

    • A finite-element model of a rat eye was created using MRI data.
    • Tissue conductivity values were assigned from literature.
    • The model was optimized and validated using multi-electrode ERG (meERG) data from healthy and lesioned rat eyes.

    Main Results:

    • The model accurately simulated corneal potential distributions, with errors comparable to biological variability.
    • The model successfully predicted potential distributions in eyes with experimental retinal lesions.
    • Changes in corneal potential distribution correlated well with lesion location.

    Conclusions:

    • A highly anatomically accurate eye model was successfully developed and validated.
    • This model provides a reliable tool for advancing ERG analysis.
    • The model can optimize ERG electrode design and support retinal functional mapping.