Which statement describes a characteristic of good conductors?

• A. They have a small resistance and allow current to pass freely.
• B. They have high resistance and block current.
• C. They are always liquids.
• D. They never heat up.

Answer: (A)

The main idea is that a good conductor offers very little opposition to the flow of electric current. Because of this low resistance, electrons can move through the material easily, so current passes through it readily. This aligns with Ohm’s law, I = V/R: for a given voltage, a smaller resistance means a larger current. So describing a good conductor as having small resistance and letting current pass freely captures the essential behavior.

If a material had high resistance, it would block or greatly limit current, which is the opposite of what a good conductor does. Conductors are not restricted to liquids; many solid metals, like copper or aluminum, are excellent conductors. And while good conductors do heat up when current flows (due to I^2R losses), they do not stay completely non-heat-producing; they can heat up under higher currents or voltages. So the statement that they never heat up is not accurate.