Which statement is true about electrical current flow?

The statement that electrical current flow is caused by a potential difference between two poles is fundamental to understanding how electricity works. When there is a potential difference, or voltage, between two points in a circuit, it creates an electric field that pushes charged particles, typically electrons, to move through a conductor. This movement of charge constitutes an electric current. The greater the potential difference, the more current can flow, assuming resistance remains constant.

In contrast, the other statements suggest misconceptions about current flow. For instance, current cannot flow without a potential difference because there would be no motive force to drive the charge. While current can flow in one direction in direct current (DC) circuits, alternating current (AC) circuits allow current to flow back and forth. Additionally, current is very much dependent on resistance as described by Ohm's Law; if resistance changes, the current will also change for a given potential difference.