Final answer:
The statement regarding lightning being able to travel through a tree to reach Earth is true since lightning can use a tree's moisture and sap as conductors. Conversely, the claim that high-voltage wires are wrapped in insulating material is false; they are held aloft by insulating connectors but are not wrapped themselves.
Step-by-step explanation:
Understanding Lightning and High-Voltage Wires
It is a common misconception that wood, being an insulator, cannot conduct electricity. The true answer to the statement 'Although wood is an insulator, lightning can travel through a tree to reach Earth' is that lightning can indeed travel through a tree. When lightning strikes a tree, it utilizes the moisture and sap inside the tree, which can act as conductors, allowing the high current to pass through and potentially reach the ground.
Regarding the second statement about high-voltage wires, it is false that they are wrapped in insulating material. These wires are uninsulated. The reason they can be touched by birds without harm is due to the lack of a voltage difference across their bodies. The wires are held aloft by insulating connectors to prevent them from making contact with the tower structure, which is grounded.
The presence of insulation is crucial in any electrical system, as it ensures the safety and functionality of the components within. Insulating connectors keep the high-voltage wires suspended and secure, while also preventing dangerous conductive paths to the grounded structures below.