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Resistance and temperature.

  • Thread starter AdmiralZ
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  • #1
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How does the resistance of a non-conductor, eg. a brick change with temperature. Does it conform to the wire where resistance increases with temperature, or is it different?
 

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  • #2
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For non conducting materials, resistance would decrease with temperature. Heat is, more or less, agitation of molecules in a substance. If the temperature is great enough, electrons can be ripped from the atoms, thus allowing a current to flow.
 
  • #3
Gokul43201
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It is very different. A "wire" is usually a conductor, whose resistivity increases with temperature due to increased scattering off the positive ions. A brick is usually an insulator (at room temp) whose resistivity decreases on heating, due to thermal excitations.
Look at this : https://www.physicsforums.com/showthread.php?t=72062&highlight=brick
 
  • #4
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Thanks guys. Also, would any of you happen to know of a site where I could find the resistances for certain objects?
 
  • #5
Gokul43201
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1. Google
2. matweb.com
3. CRC Handbook of Physics and Chemistry (universities usually have access to an online version)
 

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