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2007-09-25 03:25:51 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Change in resistance (also known as 'temperature coefficient of resistance') is a characteristic of all conductors. As was mentioned above, in most materials a higher temperature increases the probability that an electron will strike an atom of the conductor.
But there are also some materials whose resistance -decreases- with increasing temperature.
Doug
2007-09-25 03:43:42 · answer #1 · answered by doug_donaghue 7 · 1⤊ 0⤋
Because when the wire is hot, its particles move around more violently, which increases the chance of them colliding with the electrons in the current. This increases the resistance of the wire.
2007-09-25 03:34:01 · answer #2 · answered by JetAlone 2 · 1⤊ 0⤋
The resistivity of materials decrease on cooling and increase on heating.
Resistance bears a direct relation with resistivity of materials.
So resistance increases with temperature
2007-09-25 03:32:37 · answer #3 · answered by Alfred E Neuman 1 · 0⤊ 1⤋
Energy transference can be measured in heat as well as amps. Therefore, if the wire is hot there isn't as much ampacity.
2007-09-25 03:37:05 · answer #4 · answered by Handy man 5 · 0⤊ 1⤋
Depends on the material use...
2007-09-25 03:34:47 · answer #5 · answered by A 150 Days Of Flood 4 · 0⤊ 0⤋