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Electrical Conductivity01:13

Electrical Conductivity

In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
Electrical Transport01:29

Electrical Transport

The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
Resistance and Conductance01:25

Resistance and Conductance

A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their length...
Current Density01:21

Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...

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Related Experiment Video

Updated: May 27, 2026

Introducing an Angle Adjustable Cutting Box for Analyzing Slice Shear Force in Meat
09:30

Introducing an Angle Adjustable Cutting Box for Analyzing Slice Shear Force in Meat

Published on: April 26, 2013

Ohmic processing: Electrical conductivities of pork cuts.

N Shirsat1, J G Lyng, N P Brunton

  • 1Department of Food Science, Faculty of Agriculture, University College Dublin, Belfield, Dublin 4, Ireland.

Meat Science
|November 9, 2011
PubMed
Summary

Electrical conductivity in pork varies significantly between lean and fat tissues, impacting ohmic processing. Fat content non-linearly affects conductivity, with denser muscle structures showing higher conductivity.

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Area of Science:

  • Food Science
  • Electrical Engineering
  • Meat Science

Background:

  • Ohmic processing relies on electrical conductivity for effective heating.
  • Understanding component conductivities is crucial for optimizing food processing.

Purpose of the Study:

  • To determine the electrical conductivities of various pork meat cuts.
  • To investigate the influence of fat content and muscle structure on conductivity.

Main Methods:

  • Electrical conductivity measurements were performed on pork cuts.
  • Light microscopy was used to analyze muscle fiber structure and intramuscular fat.

Main Results:

  • Lean pork exhibited higher electrical conductivity than fat.
  • Increasing fat content non-linearly decreased overall conductivity.
  • Differences in conductivity between leg and shoulder lean were observed, potentially due to muscle density and intramuscular fat.

Conclusions:

  • Electrical conductivity is a critical parameter for ohmic processing of pork.
  • Variations in meat composition significantly affect processing efficacy.
  • Further research into ohmic processing of full muscle pork products is warranted.