Electrical Inspection, Testing, and Certification Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Temperature has a significant impact on the resistance of electrical conductors, particularly for metallic materials. As the temperature of a conductor increases, the atoms within the material vibrate more intensely. This agitation causes more frequent collisions between the flowing electrons and the atoms of the conductor, which in turn impedes the flow of electrical current. Consequently, the overall effect is an increase in resistance.

In metallic conductors like copper and aluminum, this relationship is typically linear within certain temperature ranges, meaning that as temperature rises, resistance increases proportionally. Understanding this relationship is crucial for electrical engineering and safety because it informs how systems are designed and how they perform under varying thermal conditions.

Other options suggest that resistance decreases, remains constant, or fluctuates randomly. However, these do not align with the established principles of conductivity and resistivity in materials, particularly metals, which are strongly affected by temperature changes.