Technician exam question T5A07
Subelement T5, ELECTRICAL PRINCIPLES· Group T5A
Why are metals generally good conductors of electricity?
- A.They have relatively high density
- B.They have many free electrons (correct answer)
- C.They have many free protons
- D.They have relatively high Young’s modulus values
WhyMetals are generally good conductors of electricity because they have many free electrons. Metals conduct electricity well because their atomic structure leaves many electrons only loosely bound, free to drift through the material and carry current, answer B. Density (A) and stiffness, Young's modulus (D), are mechanical properties unrelated to conductivity, and free protons (C) don't move through a solid metal lattice the way free electrons do.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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