The sinusoidal steady-state circuit is the most basic theory of sinusoidal AC circuit. The key in the learning process is to master the basic concepts and analysis and calculation. Keywords: sinusoidal steady-state; components; parameters; phase quantities. In addition to the resistance element R, the components in the sinusoidal AC circuit also include the inductance element L and the capacitance C. Since the latter two components are energy storage components, and the excitation power supply is sinusoidally alternating, the energy transmission, consumption and conversion process in the circuit is different from that in the DC circuit. At the same time, the variables such as voltage and current in the sinusoidal circuit cannot be measured only by size, but also by comparing their phases and the relationship between them, which is very different from the DC circuit. Full attention to these characteristics is very necessary to correctly use circuit laws and theorems and the calculation tools of sinusoidal circuits to solve various AC circuits.
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