How does temperature affect conductor resistance in a 3-phase system?

In a 3-phase system, the relationship between temperature and conductor resistance is significant. As the temperature increases, the resistance of the conductor also increases. This phenomenon occurs because, at higher temperatures, the atoms in the conductor vibrate more vigorously. The increased atomic motion causes more collisions between the free electrons (which carry the electric current) and the atoms of the conductor, impeding the flow of electricity and thus increasing the resistance.

The temperature coefficient of resistance is a key concept here, as different materials have different responses to changes in temperature. For metals, which are commonly used as conductors, the resistance tends to increase with temperature, which aligns with the principles of electrical conductivity and thermoelectric effects.

Therefore, option C accurately captures the essential relationship between temperature and conductor resistance in a 3-phase system, affirming that resistance rises as temperature escalates. Understanding this concept is vital for diagnosing issues in electrical systems and for effectively managing thermal conditions in power distribution.