Final answer:
The statement regarding high-voltage wires being wrapped in insulating material is false. While they are indeed held aloft by insulating connectors, the wires themselves are not insulated by material but are bare.
Step-by-step explanation:
The statement that high-voltage wires you see connected to tall metal-frame towers are held aloft by insulating connectors and that these wires are wrapped in an insulating material is false. High-voltage transmission lines are in fact held aloft by insulating connectors known as insulators; however, the wires themselves are not wrapped in insulating material. The air around the wires acts as an insulator. The power lines are bare and not insulated because it is more cost-effective for the power companies, and the high altitude provides adequate insulation from the ground.