Which type of wire is commonly used for residential electrical systems?

Copper wire is commonly used in residential electrical systems due to its excellent electrical conductivity, durability, and flexibility. Copper has a high resistance to corrosion, ensuring long-lasting performance, which makes it ideal for wiring in homes. Its ability to carry a substantial amount of current without overheating is a critical factor in safe electrical installations.

Aluminum wire, while also a conductor of electricity, is less conductive than copper and can be more prone to issues such as thermal expansion, which may lead to loose connections over time. Iron wire is unsuitable for electrical wiring due to its poor conductivity and susceptibility to rust. Fiber optic wire, on the other hand, is designed for data transmission rather than electrical current and is not used in traditional residential electrical systems. Therefore, copper wire stands out as the standard choice for residential wiring, providing a balance of performance and reliability.