How does temperature affect the resistance of a conductor?

• A. Resistance decreases with temperature
• B. Resistance typically increases with temperature
• C. Resistance remains unchanged
• D. Resistance only affects AC circuits

Answer: (B)

The relationship between temperature and resistance in a conductor is governed by the behavior of the atoms within the material. As temperature increases, the atoms in the conductor vibrate more vigorously. This increased atomic motion leads to more frequent collisions between the free electrons (which carry charge through the conductor) and the vibrating atoms, effectively impeding their flow.

As the number of collisions rises due to this enhanced atomic activity, the overall resistive properties of the conductor change, causing the resistance to increase. This phenomenon is particularly significant in metallic conductors, where resistance is directly related to temperature. Therefore, in most conductors, resistance typically increases with an increase in temperature.

Understanding this concept is crucial when designing electrical circuits, as it affects performance, efficiency, and safety. The other options do not accurately capture this fundamental behavior of conductors regarding temperature and resistance, making them less applicable in practical scenarios.