What unit expresses apparent power?

Apparent power is expressed in kilovolt-amperes (KVA). This unit represents the total power in an electrical circuit, both used and unused, combining the real power (in watts) and reactive power (which does not perform any work but is necessary for maintaining the electric and magnetic fields in the circuit). The concept of apparent power is crucial in AC circuits, where power factors can influence the apparent power calculations.

Understanding apparent power is essential for electrical contractors, as it helps in sizing transformers and ensuring that systems can handle the load requirements. By using the KVA measurement, electrical professionals can account for both the active and reactive components of the power. This unit facilitates better design, analysis, and troubleshooting of electrical systems, particularly in industrial and commercial applications where equipment operates under varying power factors.