What does rubber primarily act as in the context of electrical conductors?

Rubber primarily acts as an insulator in the context of electrical conductors. This is due to its molecular structure, which lacks free charges necessary for conducting electricity. The tightly bound electrons in rubber prevent the flow of electric current, making it an effective barrier. As a result, rubber is often used in various electrical applications to coat wires and components, thereby providing protection against accidental contact and preventing short circuits.

This property of rubber is critical in ensuring safety in electrical systems, as it helps to prevent unintended pathways for electricity, which could lead to shocks or fires. In contrast, materials classified as conductors allow free movement of electrons and facilitate electrical flow, while semiconductors have properties that can lead to conductivity under certain conditions. Resistors, on the other hand, are materials designed to limit the flow of current but do not serve the same insulating purpose as rubber.