Resistance of Non-Conductors: Temperature Effects

[AdmiralZ]

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?

 

[pt176900]

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.

 

[Gokul43201]

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

 

[AdmiralZ]

Thanks guys. Also, would any of you happen to know of a site where I could find the resistances for certain objects?

 

[Gokul43201]

1. Google
2. matweb.com
3. CRC Handbook of Physics and Chemistry (universities usually have access to an online version)