Which material is a common conductor?

Which material is a common conductor?

• A. Copper
• B. Plastic
• C. Glass
• D. Wood

Answer: (A)

Conduction happens best in materials with many free electrons that can move easily. Copper is a metal with a high density of free electrons and low resistivity, so electrical current flows through it with little opposition. That combination makes copper the standard material for wiring and other conductors. In contrast, plastic, glass, and wood resist current strongly (they’re insulators), so they don’t carry current well and are used to insulate or separate conductors rather than serve as the conductor itself.

Conduction happens best in materials with many free electrons that can move easily. Copper is a metal with a high density of free electrons and low resistivity, so electrical current flows through it with little opposition. That combination makes copper the standard material for wiring and other conductors. In contrast, plastic, glass, and wood resist current strongly (they’re insulators), so they don’t carry current well and are used to insulate or separate conductors rather than serve as the conductor itself.