Conductor definition: which statement best describes conductors?

• A. Materials that insulate current
• B. Materials that offer little resistance to electron movement.
• C. Materials that store charge
• D. Materials that emit light

Answer: (B)

The idea being tested is how a material allows electric current to flow. Conductors are materials that offer little resistance to electron movement, so electricity can pass through them easily. In metals, outer electrons are loosely bound and can move freely, creating a “sea” of electrons that respond to an electric field and carry current efficiently. That’s why common wires are made of metals like copper or aluminum—they have low resistivity and high conductivity.

The other descriptions don’t define conductors. Insulating materials resist current and slow or block flow, so they’re the opposite of conductors. A material that stores charge describes a dielectric or capacitor-like behavior, not easy current flow. Emitting light isn’t a defining trait of conductivity; a material can light up for various reasons and isn’t inherently a good conductor.