Certified Data Centre Professional (CDCP) Practice Exam

The relationship between Real Power and apparent power in a circuit is established through the power factor, which is a crucial concept in electrical engineering. Real Power, measured in watts (W), represents the actual power consumed by the circuit to perform useful work, while apparent power, measured in volt-amperes (VA), is a combination of both real power and reactive power.

The correct answer highlights that Real Power is equal to the product of the power factor (a dimensionless number between 0 and 1 that indicates the phase difference between voltage and current) and the apparent power. This relationship can be expressed mathematically as:

Real Power (P) = Power Factor (PF) x Apparent Power (S)

Here, the power factor accounts for the proportion of the apparent power that is used effectively as real power. Thus, this answer reflects the fundamental relationship in AC circuits, allowing one to compute real power if the power factor and apparent power are known.

The other options do not correctly describe the relationship between Real Power and apparent power. While Real Power can vary based on the load and the power factor, it does not imply that it is inherently greater than apparent power. Additionally, the assertion that Real Power does not depend on voltage levels does not