Final answer:
It is true that a remote ground in a three-wire system has an extra wire running from the circuit to ground. However, the voltage is not the same at every point in a wire, and high-voltage wires on towers are not wrapped in insulating material.
Step-by-step explanation:
Understanding Earth/Ground Connections in a Circuit
When we discuss a remote ground having an extra wire running from the circuit to the ground, this is typically true in the context of a three-wire system. The three-wire system includes a neutral wire and a ground wire, in addition to the live or hot wire. The neutral wire is connected to the earth at the voltage source and the user's location, ensuring it is at zero volts and safe to touch. The ground wire also connects to the earth, providing a low-resistance path and an additional safety measure in case of fault conditions.
Addressing the other queries, in a circuit diagram, we cannot assume that the voltage is the same at every point in a given wire since potential differences can occur, especially when there is resistance or a load present. This means that the statement 'In a circuit diagram, the voltage is the same at every point in a given wire.' is false.
Regarding high-voltage transmission lines, it is false that they are wrapped in insulating material; these wires are typically held aloft by insulators, but due to the high elevation and distance from objects, they are not wrapped in an insulating material.