active power有功功率學術名詞有效功率:計量學、電工學、電機工程、資訊、電力工程、海事有效電力:電工學、電機工程、核能、電力工程、機械工程、電力學實功率:電子工程、電力工程英文釋義the portion of power that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction.