Which of the following is a metallic conductor?

Prepare for the NGA 21 Locating and Marking of Facilities Test with our study material, flashcards, and multiple-choice questions that offer hints and detailed explanations. Get ready to succeed in your certification!

Metallic conductors are materials that let electric current flow easily because their atoms have free electrons that move freely. Copper is a metal with high electrical conductivity, so a copper pipe will conduct electricity. The other options are insulators—they resist the flow of electricity—so they are not metallic conductors.