Abstract: Concepts of apparent power and power factor as measures of a system's power delivery capability are over a century old but have not been defined in one general, rigorous and acceptable way.

Screen image captured at Beijing Aerospace Control Center in Beijing, capital of China, Oct 16, 2021 shows three Chinese astronauts, Zhai Zhigang (C), Wang Yaping (R) and Ye Guangfu, waving after ...