Final answer:
The statement about high-voltage wires being wrapped in insulating material is false; they are bare and air acts as the insulator.
Step-by-step explanation:
The statement that high-voltage wires are wrapped in insulating material is false. High-voltage wires, like those connected to tall metal-frame towers, are actually not insulated. These wires are held aloft by insulating connectors to prevent electricity from going to the ground, but the wires themselves are bare. They don't need insulation like household wires because the air around them acts as insulation, and any insulation would be impractical due to the high voltage and the difficulty in maintaining such large-scale insulation. This allows them to effectively transmit electric power over long distances with minimal loss.