Final answer:
The statement regarding high-voltage wires being wrapped in insulating material is false. Instead, these wires are held aloft by insulating connectors made of materials like porcelain or glass and are unconcealed to minimize resistance.
Step-by-step explanation:
The assertion that the high-voltage wires that are observed on tall metal-frame towers are held up by insulating connectors, and that these wires are encased in an insulating material, is false. In reality, high-voltage wires are designed to carry electricity over long distances and for this reason, they are made to be as conductive as possible. The insulation of these wires is not in the form of a material wrapped around the wire but is provided by the air and the specialized insulators that separate the wires from the metal towers.
The purpose of the insulators is to prevent the current from arcing from the wires to the tower and to the ground. These insulators are typically made from materials like porcelain or glass and are shaped to prevent water from forming a conductive path over the insulator. The high-voltage wires themselves are made of conductive metals such as copper or aluminum alloys, and these are left unconcealed to minimize resistance and power loss.