Nguyên lý tạo ra dòng điện xoay chiều hình sin Biểu thức tức thời Đồ thị vectơ Mạch thuần trở, thuần cảm, thuần dung R L C nối tiếp, R L C song song Mạch cộng hưởng Hệ số công suất Vol 2 – Chapter 1~7[.]
Ngun lý tạo dịng điện xoay chiều hình sin Biểu thức tức thời Đồ thị vectơ Mạch trở, cảm, dung R-L-C nối tiếp, R-L-C song song Mạch cộng hưởng Hệ số công suất Vol – Chapter 1~7 It is true that in some cases AC holds no practical advantage over DC With AC, it is possible to build electric generators, motors and power distribution systems that are far more effcient than DC Mutual induction Change from one polarity to the other is a smooth one, the voltage level changing most rapidly at the zero ("crossover") point and most slowly at its peak Frequency? Amplitude? AC? Peak Peak–to–peak RMS Average Relevant? Simple parallel (tank circuit) resonance Simple Harmonic Motion (SHM) With capacitive and inductive reactances equal to each other, the total impedance increases to infinity, meaning that the tank circuit draws no current from the AC power source! Simple series resonance Resonant frequency? Applications? Mixed frequency waveform Other waveshapes Spectrum analysis V & I are in phase V leads I V lags I Find the current produced by the source