Resistivity: Difference between revisions
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<onlyinclude>'''Resistivity''' is a property of materials that determines how well that material will conduct [[electricity]]. This property is closely related to [[resistance]] which is the property of a particular electrical component.</onlyinclude> Resistivity is also closely related to [[electrical conductivity]]: | [[category:Phets]] | ||
<onlyinclude>'''Resistivity''' is a property of materials that determines how well that material will conduct [[electricity]]. This property is closely related to [[resistance]] which is the property of a particular electrical component.</onlyinclude> Resistivity is also closely related to [[electrical conductivity]]:<ref name=Knight>R. D. Knight, "Conductivity and resistivity" in ''Physics for Scientists and Engineers: A Strategic Approach,'' 2nd ed. San Francisco, U.S.A.: Pearson Addison-Wesley, 2008, pp. 954-956</ref> | |||
< | <math>\rho = \frac{1}{\sigma}</math> | ||
Where < | Where <math>\rho</math> is the resistivity (in [[Ohm]]/[[meter|m]]) and <math>{\sigma}</math> is the conductivity (in [[meter|m]]/[[Ohm]])). To determine the resistance of a [[wire]] (which could be made of almost anything: [[copper]], [[aluminum]], this equation even works for wood!) | ||
< | <math>R = \rho \frac{A}{l}= \frac{A}{\sigma l}</math> | ||
where < | where <math>A</math> is the area (in m<sup>2</sup>) and <math>l</math> is the length (in [[meter|m]]). | ||
For more detailed information on resistivity please see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c2hyperphysics hyperphysics]. Hyperphysics also has a [http://hyperphysics.phy-astr.gsu.edu/hbase/tables/rstiv.html table of resistivities] for different materials. Resistivity also depends on [[temperature]], which is also explained on [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html hyperphysics]. | For more detailed information on resistivity please see [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c2hyperphysics hyperphysics]. Hyperphysics also has a [http://hyperphysics.phy-astr.gsu.edu/hbase/tables/rstiv.html table of resistivities] for different materials. Resistivity also depends on [[temperature]], which is also explained on [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html hyperphysics]. | ||
Revision as of 21:41, 18 May 2018
Resistivity is a property of materials that determines how well that material will conduct electricity. This property is closely related to resistance which is the property of a particular electrical component. Resistivity is also closely related to electrical conductivity:[1]
Where is the resistivity (in Ohm/m) and is the conductivity (in m/Ohm)). To determine the resistance of a wire (which could be made of almost anything: copper, aluminum, this equation even works for wood!)
where is the area (in m2) and is the length (in m).
For more detailed information on resistivity please see hyperphysics. Hyperphysics also has a table of resistivities for different materials. Resistivity also depends on temperature, which is also explained on hyperphysics.
PhET: Resistance in a wire
The University of Colorado has graciously allowed us to use the following Phet simulation. Explore the simulation to see how resistance changes depending on geometry and resistivity:
- ↑ R. D. Knight, "Conductivity and resistivity" in Physics for Scientists and Engineers: A Strategic Approach, 2nd ed. San Francisco, U.S.A.: Pearson Addison-Wesley, 2008, pp. 954-956