Question

How does the resistance of carbon increase or decrease with rise in temperature?

Answer 1

temp. is directly proportional to resistance

so,

the resistance of carbon changes according to the temperature

i think i m right

and i think its useful to u

Answer 2

The higher temperature increases the vibration of the electrons (and atoms) in the material, which loosens the binding force of the electrons to the nuclei allowing them to be emitted and move more freely with less potential.

A negative coefficient for a material means that its resistance decreases with an increase in temperature. Semiconductor materials (carbon, silicon, germanium) typically have negative temperaturecoefficients of resistance.