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The formula for calculating power (P) is given by the product of current (I) and potential difference (V). This relationship is foundational in electrical physics and can be expressed in the equation:

P = I × V.

This means that the power consumed by an electrical component is directly proportional to both the current flowing through it and the voltage across it. When current flows through a voltage source, it does work, and this work done per unit time is defined as power.

The other options do not represent the correct relationship for calculating electrical power. For instance, dividing voltage by current yields resistance (according to Ohm's law), while adding or subtracting current and voltage does not have a relevant physical meaning in terms of power calculations in basic electrical circuits. Thus, the correct approach to calculate power in electrical systems is indeed through the product of current and potential difference.