Nate Core Practice Test

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How is the formula for power factor expressed using watts?

V × A = Watts
V / A = Watts
A / V = Watts
Watts = V - A

The correct answer is: V × A = Watts

The expression for power factor in electrical systems is closely related to the true power consumed, which is measured in watts. The correct formulation, V × A = Watts, indicates that power (in watts) is calculated as the product of voltage (V) and current (A). This relationship is fundamental in understanding how electrical circuits operate. Voltage, measured in volts, represents the electric potential difference. Current, measured in amperes (A), represents the rate of flow of electric charge. By multiplying these two components, you find the amount of electrical power being used in the circuit. In the context of power factor, which is a measure of the efficiency of electrical power usage, it provides insight into how much of the total power (apparent power) is being effectively utilized in the circuit. A power factor of one (or 100%) means that all of the power being generated is used effectively, while values less than one indicate some power loss, often due to reactive power in inductive loads. Understanding this relationship is crucial for anyone studying electrical engineering or working in fields that involve power distribution and energy efficiency.