Final answer:
The statement about high-voltage wires being wrapped in insulating material is false as air acts as an insulator for these wires, and wood can conduct lightning despite being an insulator.
Step-by-step explanation:
Some students might be confused about the properties of insulating materials when they learn about the infrastructure of electrical transmission. Regarding high-voltage wires, the statement that these wires, which are connected to tall metal-frame towers, are held aloft by insulating connectors, and are wrapped in an insulating material, is false. While they are indeed held by insulating connectors to prevent electrical current from flowing down the towers, high-voltage transmission wires are not typically covered with insulating material because the air acts as an insulator and due to the cost and impracticality of insulating long stretches of wire.
Moving on to a different subject but related to insulation properties, it's true that although wood is generally an insulator, lightning can travel through a tree to reach the ground. This is because lightning is a massive electrical discharge capable of overcoming the resistive properties of wood, especially if it's wet.