Which material is commonly used to carry electrical current?

• A. Aluminum
• B. Copper wire
• C. Glass
• D. Plastic

Answer: (B)

Copper is the material commonly used to carry electrical current because it combines excellent conductivity with practical advantages for wiring. Its high electrical conductivity means wires have low resistance, so less energy is lost as heat. Copper is also very ductile and malleable, making it easy to draw into thin wires and bend into intricate routes without breaking. It forms durable electrical connections, resists corrosion in most environments, and is readily available and workable with standard tools and fittings. By contrast, glass and plastic are insulators and do not carry current; they’re used to insulate or surround conductors rather than serve as the conducting material. Aluminum can conduct electricity as well, but its conductivity is lower than copper’s and it presents more challenges with connections and long-term reliability in some applications, though it’s used in specific scenarios like some overhead lines or where weight and cost are critical. In everyday wiring, copper is the go-to conductor.