What is the formula to calculate electrical power in a circuit?

The formula to calculate electrical power in a circuit is expressed as P = V × I. In this equation, P represents power measured in watts (W), V represents voltage measured in volts (V), and I represents current measured in amperes (A). This relationship indicates that the power consumed or generated in an electrical circuit is the product of the voltage across the circuit and the current flowing through it.

Understanding this formula is crucial because it reflects the fundamental concept that higher voltage or current results in increased power consumption. For example, in practical applications, if you increase the voltage while keeping the current constant, the power will increase proportionally. This equation is widely used in electrical engineering and practical electrical applications to calculate how much energy a device uses or how much work it performs over time.

The other options represent different relationships involving electrical quantities but do not yield power in the same direct way as the voltage-current relationship defined in P = V × I.