Which of the following is a formula for calculating power?

The formula P = I × E is correct for calculating power in an electrical context. In this formula, P represents power measured in watts, I represents current measured in amperes, and E represents voltage measured in volts. The relationship shows that power is the product of current and voltage, which aligns with the electrical principles where power is the rate at which electrical energy is transferred by an electric circuit.

This concept is foundational in electrical engineering as it connects the two critical components of an electric circuit: voltage and current. Understanding this formula allows one to calculate how much power is being consumed or produced in a circuit, making it a crucial tool for electrical analysis and design.

The other choices represent different relationships in electrical theory, but they do not provide the direct formula for calculating power as defined by the relationship between current and voltage.