Which statement about copper's suitability in wiring is best explained?

• A. It is magnetic
• B. It is expensive and heavy
• C. It resists corrosion well
• D. It conducts electricity efficiently

Answer: (D)

Copper is chosen for wiring largely because it conducts electricity efficiently. Its low resistivity means electrons flow with minimal opposition, so electrical energy is transmitted with less heat loss and can be carried over longer distances or with thinner wires for the same current. This efficiency is the key reason it’s so well suited to wiring, enabling reliable performance and safer, more economical installations. Copper’s ductility and good corrosion resistance help with manufacturability and longevity, but these support qualities rather than the main reason. The other options don’t explain suitability as directly: being magnetic doesn’t enhance typical wiring performance, and while copper’s weight and cost are considerations, they don’t account for why it’s preferred for conducting electricity.