NCCER Introduction To Electrical Circuits (26103-23) Practice Test

Copper is classified as a(n)?

Conductor Insulator Semiconductor Superconductor

Correct Answer:

Conductor

Explanation:

Copper is a conductor. Metals like copper have many free electrons that can move easily when an electric field is applied, creating a path for current to flow with relatively low resistance. This makes copper ideal for wiring and electrical connections. An insulator, by contrast, tightly binds its electrons and resists current flow; a semiconductor has conductivity that can be controlled and is typically between a conductor and an insulator; a superconductor carries current with zero resistance but only at very low temperatures for most materials. Under normal conditions, copper has measurable resistance, so it’s not a superconductor.

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