Which term describes a material that resists the flow of electricity?

The term that describes a material that resists the flow of electricity is "insulator." Insulators are materials that have very high resistance to electric current, meaning they do not allow electricity to pass through them easily. Common examples of insulators include rubber, glass, and plastic, which are often used to coat or encase electrical wires to prevent unintended transmission of electrical energy.

In contrast, conductors are materials that allow the easy flow of electricity due to their low resistance; examples include copper and aluminum. Semiconductors have properties intermediate between conductors and insulators, allowing them to conduct electricity under specific conditions, which is crucial for electronic devices. Sheathing refers to the protective covering around insulated wires, but it is not a term that describes a material based on its electrical properties. Therefore, the correct choice aligns perfectly with the definition of a material that resists electric current flow.