What happens to resistance in a high voltage wire when it is scratched?

When a high voltage wire is scratched, its resistance increases due to the damage inflicted on the conductive material. The scratch can disrupt the uniformity of the wire's surface. This disruption can create a greater surface area for potential corrosion or oxidation, which can further hinder the flow of electric current. Also, if the scratch penetrates deeply enough to expose the conductor, it may compromise the integrity of the wire, leading to more resistance being introduced into the circuit.

High-voltage wires are designed with specific electrical and thermal properties to ensure efficient current flow. A scratch can create points of resistance where the current faces obstacles, causing it to struggle to pass through, which in turn raises the overall resistance of the wire. This phenomenon is crucial because increased resistance can lead to higher power losses and could pose safety risks, particularly in high voltage applications where maintaining proper resistance levels is essential for optimal functionality and safety.