What is the formula for calculating electrical power?

The formula for calculating electrical power is defined as power (P) equals voltage (V) times current (I). This relationship derives from the fundamental principles of electricity, specifically Ohm's Law, which states that voltage (V) is equal to current (I) multiplied by resistance (R). By rearranging Ohm's Law, we understand that power is a product of the voltage applied across an electrical component and the current flowing through that component.

When voltage is applied in a circuit, the current that flows can be calculated using the relationship P = VI. This equation indicates that, at a constant voltage, increasing the current will directly increase the power consumed or utilized by an electrical device. Conversely, at constant current, increasing the voltage will also result in increased power. This understanding is crucial in electrical calculations and applications, making option A the correct choice for calculating electrical power.

In contrast, the other options do not accurately represent the relationship between power, voltage, and current. They either misuse mathematical operations or misrepresent the relationship between these electrical quantities.