As shown in figure "D" of the illustrated digital power meter, what display of text represents the reactive power consumed by the load? See illustration EL-0256.
• Difference between real power (kW), apparent power (kVA), and reactive power (kVAR) in an AC circuit • Meaning of power factor (PF) and how it relates to real and apparent power • How a digital power meter labels each quantity on a W (power) display screen
• For each choice, decide whether the unit shown measures real power, apparent power, reactive power, or a ratio with no units • Think about the power triangle: which side represents reactive power, and what are its typical units? • Ask yourself which displayed quantity would change mainly with the phase angle between voltage and current rather than with just their magnitudes
• Identify which option uses units specifically associated with reactive power in AC systems • Confirm that kW is tied to real (true) power actually doing work, not stored-and-returned energy • Verify that PF is a dimensionless ratio (no power units) and kVA represents apparent power, leaving only one value that matches reactive power
No comments yet
Be the first to share your thoughts!