Final answer:
An outdoor receptacle used for a permanent connection must have a weatherproof cover, which is true. High-voltage wires on towers are not insulated, which is false. Large voltage drops in cords can reduce appliance functionality.
Step-by-step explanation:
The statement that outdoor receptacle covers must maintain the weatherproof integrity of the receptacle when used for the permanent connection of a cord from a 12-volt low-voltage lighting transformer is true. According to standard electrical safety regulations, any outdoor electrical installation must be adequately protected against the elements to prevent short circuits, shocks, and damage to the connected devices. This typically includes using a cover that is specifically designed to keep the receptacle dry and shielded from weather conditions while in use.
For instance, while the high-voltage wires connected to metal-frame towers are indeed held aloft by insulating connectors, these wires are not typically covered with insulating material as they are high above the ground where contact with people is unlikely. Hence, the answer to that question would be false.
In another example, when discussing electrical outlets and appliance operation, if the extension cord has a large voltage drop, it can lead to the voltage supplied to an appliance being reduced. As a consequence, the power output and performance of the appliance may be significantly decreased, resulting in inadequate functioning.
Additionally, lightning can indeed travel through insulating materials like wood if a sufficient voltage potential is present, making the statement true that lightning can use a tree to reach Earth.