What is the formula for calculating power factor?

The power factor represents the relationship between active power (measured in watts) and apparent power (measured in volt-amperes) in an electrical system. It is crucial for understanding the efficiency of power usage in an electrical circuit. The formula for calculating power factor is derived from the relationship:

Power Factor (PF) = Real Power (Watts) / Apparent Power (Volt-Amps).

Given that apparent power is calculated by multiplying voltage (in volts) and current (in amps), the formula can be rearranged to be expressed in terms of Watts:

Power Factor = Watts / (Volts x Amps).

This directly correlates with the choice of Watts divided by the product of Volts and Amps, indicating that the correct answer reflects the appropriate definition of power factor. Understanding this relationship helps in assessing how effectively electrical power is being utilized and can be critical in energy management and engineering applications.