Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Electrical conductivity


Related Topics

  
  Herguth - TOC - Electrical Conductivity/ Dielectric Strength
The unit of electrical conductivity involves the reciprocal of resistance (1/ohm or mho) and a distance, and is mho cm-1.
Electrical conductivity and dielectric breakdown voltage of oils are important in lubricated components subjected to stray or self-generated electric currents.
Electrical conductivity or its reciprocal, resistance, is measured with an apparatus which determines the current flowing through an oil between immersed electrodes at a constant distance apart.
www.herguth.com /TABLE_OF_CONTENTS/electrical_conductivity_dielectric_strength.htm   (453 words)

  
  Electrical conductivity - Wikipedia, the free encyclopedia
Electrical conductivity or specific conductivity is a measure of a material's ability to conduct an electric current.
The conductivity of a semiconductor is generally intermediate, but varies widely under different conditions, such as exposure of the material to electric fields or specific frequencies of light, and, most important, with temperature and composition of the semiconductor material.
In metals, electrical conductivity decreases with increasing temperature, whereas in semiconductors, electrical conductivity increases with increasing temperature.
www.sciencedaily.com /encyclopedia/Electrical_conductivity   (690 words)

  
 ESC Electrical Conductivity
An electric current is connected to one or two of the electrodes (depending on the measurement method used), and the voltage difference is then measured between the electrodes.
The greater the voltage difference, the lower the electrical conductivity of the soil which is in contact with the probe.
Electrical conductivity logging was used at this former manufactured gas plant (FMGP) site to rapidly gather information about the depth and thickness of certain clay-rich and sand-rich soils layers previously known to exist at the site.
www.etd.ameslab.gov /etd/technologies/projects/esc/technologies/elecconductivity.html   (677 words)

  
 Is there a relationship between electrical conductivity and thermal conductivity?
The electrons which are free to respond to the electric field have a thermal speed a sizable percentage of the speed of light, but since they travel randomly with this high speed, they go nowhere on average, i.e., this thermal speed itself doesn't create any current.
Both thermal and electrical conductivity depend in the same way on not just the mean free path, but also on other properties such as electron mass and even the number of free electrons per unit volume.
The upshot is that the ratio of thermal to electrical conductivity depends primarily on the square of the thermal speed.
www.physlink.com /Education/AskExperts/ae432.cfm   (542 words)

  
  Electrical Conductivity | World of Physics
The electrical conductivity of a material is defined as the ratio of the current per unit cross-sectional area to the electric field producing the current.
Electrical conductivity is an intrinsic property of a substance, dependent on the temperature and chemical composition, but not on the amount or shape.
Electrical conductivity in the liquid state is generally due to the presence of ions.
www.bookrags.com /research/electrical-conductivity-wop   (984 words)

  
  Electrical conductivity - Wikipedia, the free encyclopedia
Electrical conductivity is a measure of a material's ability to conduct an electric current.
The conductivity of a semiconductor is generally intermediate, but varies widely under different conditions, such as exposure of the material to electric fields or certain frequencies of light.
electrical resistivity is the inverse of electric conductivity
en.wikipedia.org /wiki/Electrical_conductivity   (302 words)

  
 [No title]
The purpose of this study was to examine the influence of smectite properties on the complex electrical conductivity spectra of hydrated smectitic clays.
Values of the dc electrical conductivity (0), the frequency where the slope changes in the spectra (fr), and the slope at the high-frequency end of the spectra (n) were determined by fitting ' to '(f) = 0(1 + f/fr)n.
The ratio of the thermal conductivity to the electrical conductivity of a metal is proportional to the temperature.
www.lycos.com /info/electrical-conductivity.html   (858 words)

  
 Electrical conductivity   (Site not responding. Last check: )
Conductance is an electrical phenomenon where a material contains movable particles of electricity.
Electrical conductivity is the reciprocal of electrical resistivity (ohms).
It is the ratio of the current density to the electric field strength.
knowallabout.com /e/el/electrical_conductivity.html   (163 words)

  
 Electrical conductivity - Wikipedia
Electrical conductivity is a measure of how well a material accommodates the transport of electric charge.
When a difference of electrical potential is placed across a conductor, its movable charges flow, and an electric current appears.
A conductor such as a metal has high conductivity, and an insulator like glass, or the vacuum, has low conductivity.
wikipedia.findthelinks.com /el/Electrical_conductivity.html   (146 words)

  
 Thermal conductivity - Wikipedia, the free encyclopedia
In physics, thermal conductivity, k, is the intensive property of a material that indicates its ability to conduct heat.
A thermal conductance tester, one of the instruments of gemology, determines if gems are genuine diamonds using diamond's uniquely high thermal conductivity, which is higher still for natural blue diamond.
Although this expression is exact, in order to calculate the thermal conductivity of a dense fluid or solid using this relation requires the use of molecular dynamics computer simulation.
en.wikipedia.org /wiki/Thermal_conductivity   (880 words)

  
 EPA > OWOW > Monitoring and Assessing Water Quality > Volunteer Stream Monitoring: A Methods Manual > ...
Conductivity is a measure of the ability of water to pass an electrical current.
Conductivity in water is affected by the presence of inorganic dissolved solids such as chloride, nitrate, sulfate, and phosphate anions (ions that carry a negative charge) or sodium, magnesium, calcium, iron, and aluminum cations (ions that carry a positive charge).
Conductivity is measured with a probe and a meter.
www.epa.gov /owow/monitoring/volunteer/stream/vms59.html   (1081 words)

  
 Factors Influencing Electrical Conductivity
Electrical conductivity of earth materials is influenced by the metal content (sulfides) in the rock, porosity, clay content, permeability, and degree of pore saturation.
The minerals themselves may not be very conductive, but their surface ge causes an excess of cations in the pore fluid immediately adjacent to the clay surfaces.
At the aquifer level, the resistivity, transverse resistance, and horizontal conductance, as measured by surface resistivity and EM soundings or well logs, are compared to average hydraulic conductivity, transmissivity, and leakance.
www.freewebtown.com /geophysics2/factors-aff-cond.html   (903 words)

  
 ESC Electrical Conductivity   (Site not responding. Last check: )
An electric current is connected to one or two of the electrodes (depending on the measurement method used), and the voltage difference is then measured between the electrodes.
The greater the voltage difference, the lower the electrical conductivity of the soil which is in contact with the probe.
Electrical conductivity logging was used at this former manufactured gas plant (FMGP) site to rapidly gather information about the depth and thickness of certain clay-rich and sand-rich soils layers previously known to exist at the site.
www.epsci.ameslab.gov /etd/technologies/projects/esc/technologies/elecconductivity.html   (677 words)

  
 Outokumpu Copper - Electrical conductivity   (Site not responding. Last check: )
Another significant factor on conductivity is the operation temperature: the higher the temperature is, the lower the conductivity.
The correlation is seen in the figure, where the electrical conductivity is expressed as a function of yield strength obtained by cold working.
Electrical conductivity as a function of 0,2% yield strength obtained by cold working.
www.outokumpucopper.com /pages/Page____8927.aspx   (197 words)

  
 Research in EES-11 - LANL
Recent laboratory measurements of electrical conductivity of mantle minerals that were conducted in the multi-anvil presses of the Bayerisches Geoinstitut of the University of Bayreuth have provided the basic data on their electrical conductivities at mantle conditions of temperature and pressure.
Electrical conductivity of Earth's mantle is influenced by many factors, which include temperature, pressure, the coexistence of multiple mineral phases, and oxygen fugacity.
Olivine conductivity increases by approximately 30% at the transition to wadsleyite corresponding to the 410-km discontinuity.
www.ees11.lanl.gov /EES11/Staff/Shankland/conductivity.html   (2204 words)

  
 DoITPoMS TLP - Introduction to Anisotropy - Electrical conductivity
In metals, conductivity occurs by transport of delocalised electrons through the crystalline lattice, under the influence of an applied electric field.
The conductivity is limited by the scattering of the electrons by imperfections in the periodicity of the structure (vibrations, impurities, etc).
Conduction is very much less perpendicular to the planes (around three orders of magnitude smaller) - this is highly anisotropic behaviour.
www.doitpoms.ac.uk /tlplib/anisotropy/electrical.php   (311 words)

  
 [No title]   (Site not responding. Last check: )
The metallic alloy exhibiting relatively low thermal conductivity and electrical conductivity may be provided as a coating suitable for thermal and/or electrical barrier applications on a variety of substrates.
Because the relatively high thermal conductively and electrical conductivity arise from the free electrons in the unfilled outer energy bands of the metal, as the free electron density is reduced, so are the electrical conductivity and the thermal conductivity.
Note that the conductivity of the coatings is lower than that of titanium which is the lowest thermal conductivity metal and at room temperature are even lower than alumina ceramic (see Table 2).
www.wipo.int /cgi-pct/guest/getbykey5?KEY=04/72313.040826&ELEMENT_SET=DECL   (2031 words)

  
 Electrical Properties
Electrical conductivity is a measure of how well a material accommodates the movement of an electric charge.
Electrical conductivity is a very useful property since values are affected by such things as a substances chemical composition and the stress state of crystalline structures.
Therefore, electrical conductivity information can be used for measuring the purity of water, sorting materials, checking for proper heat treatment of metals, and inspecting for heat damage in some materials.
www.ndt-ed.org /EducationResources/CommunityCollege/Materials/Physical_Chemical/Electrical.htm   (926 words)

  
 Electrical Conductivity
Conductance is directly proportional to the electrode surface area and inversely proportional to the distance between the electrodes.
Conductivity results given alone are very limiting as they do not measure individual contaminants nor the overall state of the water (MEND, 2001).
The conductivity of a sample is measured with a self-contained conductivity meter (Wheatstone bridge or equivalent).
ecorestoration.montana.edu /mineland/guide/analytical/chemical/water/ec.htm   (296 words)

  
 Diamonds | American Museum of Natural History
The somewhat metallic luster of graphite announces its capacity to conduct electricity.
Both diamond and graphite have important applications in electronics: Diamond may be used as either an insulator (nonconductor) or a semiconductor, and graphite is commonly used as a conductor.
A substance is an electrical conductor if very little energy is required to move an electron from its bonded condition -- in the so-called valence band -- to a mobile condition in the conduction band.
www.amnh.org /exhibitions/diamonds/electric.html   (174 words)

  
 Electronic Connectors: Electrical Conductivity   (Site not responding. Last check: )
When used for connectors or other electrical applications, the inherently high electrical conductivity of copper and copper alloys is very important.
The conductivity of copper is expressed in units of a percentage of IACS (International Annealed Copper Standard).
The higher the %IACS, the more conductive the material is. It is not uncommon for commercially pure copper products to have IACS conductivity values greater than 100 because of improved processing techniques which have been developed since the adoption of the standard in 1913.
www.connector.org /electrical.html   (146 words)

  
 DoITPoMS TLP - Introduction to Anisotropy - Electrical conductivity
In an analogous way to thermal conductivity, the current density does not have to be parallel to the electric field.
The conductivity is limited by the scattering of the electrons by imperfections in the periodicity of the structure (vibrations, impurities, etc).
Conduction is very much less perpendicular to the planes (around three orders of magnitude smaller) - this is highly anisotropic behaviour.
www.msm.cam.ac.uk /doitpoms/tlplib/anisotropy/electrical.php   (311 words)

  
 Waterwatch Australia national technical manual: module 4 - physical and chemical parameters: methods - electrical ...
Therefore, electrical conductivity is routinely used to measure salinity.
The electrical conductivity of water samples should be measured on the spot at the waterbody.
Each waterway or waterbody tends to have a relatively consistent range of electrical conductivity values that, once known, can be used as a baseline against which to compare regular measurements of conductivity.
www.waterwatch.org.au /publications/module4/electrical.html   (1317 words)

  
 Chapter 19. Electrical Properties
The electrical conductivity is the inverse of the resistivity:
Electrical conduction requires that electrons be able to gain energy in an electric field; this is not possible in these materials because that would imply that the electrons are promoted into the forbidden band gap.
Conduction in insulators is by electrons in the conduction band and by holes in the valence band.
www.virginia.edu /bohr/mse209/chapter19.htm   (2258 words)

  
 IngentaConnect Electrical conductivity evolution of non-saturated carbonate rock...   (Site not responding. Last check: )
We show that when saturation is decreased the conductivity increase occurs earlier during the deformation process, from 68 to 17 per cent of strength for 100 to 80 per cent of water saturation, respectively, so that the decrease in conductivity at low stress is less and less present.
The induced relative rock conductivity variation in non-saturated and undrained conditions is the result of two competing effects: the relative porosity variation and the relative saturation variation during the deformation process.
During compaction the electrical conductivity can show either a small decrease or a small increase; since the size of the partially saturated pores and cracks is reduced, the water occupies a larger percentage of the pore space, and then conductivity can be increased at this stage.
www.ingentaconnect.com /content/bsc/gji/2006/00000167/00000002/art00045   (493 words)

  
 Soil Electrical Conductivity Variability
Conductivity varied in both space and time, but the spatial patterns in conductivity were temporally stable.
Soil electrical conductivity may be useful in production agriculture because it relates to factors that affect soil productivity, use, and management.
Measurement of apparent electrical conductivity of soils by an electromagnetic induction probe to aid in salinity surveys.
www.bae.uky.edu /~precag/PrecisionAg/Reports/Soil_EC_Var/soil_electrical_conductivity_var.htm   (2488 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.