What must occur for the flow of electrons along a wire?

For electrons to flow along a wire, electrical pressure, also known as voltage, must be present. Voltage is the driving force that pushes electrons through the conductor, creating an electrical current. Without this pressure, electrons do not have the energy needed to move across the wire, resulting in no current flow.

While low resistance is favorable for efficient current flow, it doesn't initiate the flow; it merely allows for a greater flow of current when voltage is applied. High temperatures can affect resistance but aren't a requirement for the flow of electrons themselves. Additionally, a broken circuit would halt electron flow, as a continuous path is necessary for the current to travel. Overall, the presence of voltage is essential, as it establishes the potential difference needed to facilitate the movement of electrons through the wire.