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The use of copper wires for power transmission is largely due to their balance of conductivity, cost, and weight. While large diameter wires and silver wires can theoretically carry significant amounts of current, they present challenges that can make them less desirable in practical applications.

Silver is known to be an excellent conductor, even better than copper. However, its high cost makes it impractical for widespread use in power transmission. In contrast, copper is abundant and offers a good conductivity-to-cost ratio, making it a more suitable choice for the majority of power transmission needs.

Large diameter wires can carry greater current but introduce issues related to handling and installation, and the sheer weight can complicate structural support requirements. In professional settings, practicality and cost-effectiveness play substantial roles in the decisions surrounding materials for power transmission. Thus, the expense associated with silver and the bulkiness of large diameter wires contribute to their limited use in comparison to copper wires.