- Xem d? ?oán b?ch th? two s? cu?i c?a các gi?i ??c bi?t và gi?i 8 c?a các t?nh s?p m? th??ng hôm nay.Theory: Readings exhibit the efficient voltage determined by the normal price of samples more than an entire range of periods of the elemental frequencyHarmonics are periodic distortions of voltage, existing, or power sine waves. Harmonics in