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Ohm's Law is a fundamental principle in electrical engineering and physics that defines the relationship between voltage (potential difference), current, and resistance in a circuit. According to Ohm's Law, the current flowing through a conductor (like a wire) is directly proportional to the potential difference across it, provided that the temperature and material properties remain constant.

This relationship can be mathematically represented as \( I = \frac{V}{R} \), where \( I \) is the current, \( V \) is the voltage (potential difference), and \( R \) is the resistance. This equation illustrates that as the voltage increases, the current increases, assuming that the resistance does not change. Therefore, in the context of the question, the correct factor that is directly proportional to the current is indeed the potential difference.

Resistance, while also related to current, does not affect the direct proportionality stated in Ohm's Law, as resistance is the opposition to current flow, rather than a factor that varies directly with it. Current itself is the subject of the law, and charge relates to the flow of current but does not represent a direct proportional relationship in the context of the law.