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What happens in the resistance of copper wire when its temperature is raised?

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IPRC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 10 Dec 2016)
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  1. Decrease
  2. Increase
  3. Steady
  4. Zero

Answer (Detailed Solution Below)

Option 2 : Increase
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Concept

  • Resistance is the property of a material by virtue of which the movement of electrons is restricted or the friction during the flow of electrons is increased.
  • Resistance exhibited by conductors follows a direct proportionality with temperature.
  • As for semiconductors, resistance and temperature are indirectly proportional.

Explanation:

  • Copper behaves as a metallic conductor. It has a sea of freely moving electrons that are characteristic of a metallic conductor.
  • When the temperature is increased, the thermal perturbation is increased. This results in the disconcerting motion of electrons and therefore resistance is increased.
  • The decrease in temperature has the opposite effect, and so on decreasing the temperature the resistance of copper is decreased.
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