Which formula correctly calculates electrical power?

The formula that accurately calculates electrical power is P = VI. This equation states that power (P) is the product of voltage (V) and current (I). In electrical circuits, power is a measure of how much energy is used or produced over time. By multiplying voltage, which represents the potential difference that drives current through a circuit, by the current, which is the flow of electric charge, you calculate the total power consumed or generated.

Understanding this formula is fundamental in electrical theory because it allows you to assess the efficiency of electrical systems. For example, in household wiring, knowing the voltage supplied and the current draw of appliances can help in determining the total power requirements, which is crucial for designing circuits that can safely deliver the necessary energy.

This formula is applicable in various contexts, including AC and DC circuits, where knowing the relationship between voltage, current, and power is essential for troubleshooting, energy efficiency calculations, and overall system design.