NHA2778903-13

电流相角与电压相角的偏移

电流可能会滞后、超前、或与交流电压波形同相,通常与负载类型有关 – 电感负载、电容负载或阻性负载。

对于纯阻性负载,电流波形与电压波形同相。对电容负载,电流超前电压。对电感负载,电流滞后电压。

下图显示在理想(实验室)环境下,各负载类型的电压和电流波形如何偏移。

电流与电压同相(阻性负载) 电流超前电压(电容负载) 电流滞后电压(电感负载)
The image illustrates the behavior of electrical signals in a purely resistive circuit. It features two sinusoidal waveforms—voltage (V) shown as a solid blue line and current (I) as a dashed green line—both having the same frequency and phase alignment. The horizontal axis represents time, with key phase markers at 90° and 270°. A resistor symbol is placed between the V and I labels to indicate the resistive nature of the circuit. On the right side, a phasor diagram displays voltage vectors (Va, Vb, Vc) and current vectors (Ia, Ib, Ic), all aligned to show that voltage and current are in phase. The image illustrates the phase relationship between voltage and current in a capacitive circuit. On the left, a graph displays two sinusoidal waveforms: voltage (V) in blue and current (I) in green. The current waveform leads the voltage waveform by 90 degrees, indicating a capacitive load. On the right, a phasor diagram shows voltage vectors Va, Vb, Vc and current vectors Ia, Ib, Ic, representing the phase angles and magnitudes of each phase in a three-phase system. The image illustrates the phase relationship in an inductive circuit. On the left, two sinusoidal waveforms are shown: voltage (V) in blue and current (I) in green. The current waveform lags the voltage waveform by 90 degrees, indicating inductive behavior. On the right, a phasor diagram displays voltage vectors (Va, Vb, Vc) and current vectors (Ia, Ib, Ic), representing the phase angles and magnitudes of each phase in a three-phase system.
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