江蘇春晨電纜有限公司生產JBHF1140 2000 電機引接線，
上相量式既表示了電壓與電流的數值關係，又表示了它們的相位關係。ji說明了電壓相量是在電流相量的基礎上逆時針方向旋轉了90°，電壓、電流之間的相位差角為90°。電壓、電流之間的相量圖如上圖c所示。
The upphasor represents not only the numerical relationship between voltage and current, but also their phase relationship. Ji shows that the voltage phasor rotates 90 ° anticlockwise on the basis of current phasor, and the phase difference angle between voltage and current is 90 °. The phasor diagram between voltage and current is shown in Figure C above.
功率關係
Power relation
電感電路的瞬時功率為：
The instantaneous power of the inductive circuit is:
電感電路的瞬時功率計算公式
Calculation formula of instantaneous power of inductive circuit
瞬時功率pL的波形如上圖d所示，從圖中可以看出，pL的幅值為UI，頻率為2ω，即pL以2倍於電流的頻率按正弦規律變化。當u、i同為正值或同為負值時，如圖d中第1、第3個1/4周期，pL為正值，說明在這個時段內，電感從電源吸收電能，並將電能轉換為磁能儲存起來；當u、i方向相反時，如圖d中第2個、第4個1/4周期，pL為負值，說明在這個時段內，電感將儲存的磁場能轉換成電能送回電源。瞬時功率正、負半周包圍的面積相等，說明電感從電源吸收的電能等於送回電源的電能。即：JBHF1140 2000 電機引接線
The waveform of the instantaneous power pl is shown in Figure d above. It can be seen from the figure that the amplitude of PL is UI and the frequency is 2 ω, that is to say, PL changes according to the sinusoidal law with the frequency twice that of the current. When u and I are both positive or negative, as shown in the first and third 1 / 4 cycles of figure D, and PL is positive, it means that in this period, the inductor absorbs electric energy from the power supply and converts the electric energy into magnetic energy for storage; when u and I are in the opposite direction, as shown in the second and fourth 1 / 4 cycles of figure D, PL is negative, it means that in this period, the inductor converts the stored magnetic energy into electric energy for transmission and return Source. The area surrounded by the positive and negative half cycles of instantaneous power is equal, which means that the electric energy absorbed by the inductor from the power source is equal to the electric energy returned to the power source. Namely:
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