What is the formula to calculate electrical power?

The formula to calculate electrical power is given by the product of voltage and current. This relationship is foundational in electrical engineering and is expressed mathematically as:

Power (P) = Voltage (V) × Current (I).

This formula indicates that power is directly proportional to both voltage and current; increasing either one will lead to an increase in power consumption or generation.

When using this formula in practical applications, it's crucial to understand that power, measured in watts (W), reflects the rate at which electrical energy is transferred by an electric circuit. Therefore, when you have both the voltage across and the current flowing through a component or circuit, you can accurately determine how much power that component is using or producing.

In contrast, the other options provided do not correctly represent the relationship needed to calculate electrical power. For example, resistance divided by voltage does not yield power, and current divided by resistance leads to calculating voltage, while voltage plus current does not have a defined electrical meaning in the context of power. The correct understanding of this concept is essential for analyzing and designing electrical systems.