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RLC串聯電路電壓與電流的關系

發布日期:2022-04-26 點擊率:569

  1、相量關系
  
  復阻抗:
  阻抗分兩部分:實部為“阻”――電阻;虛部為“抗”――電容、電感
 
  注意:復阻抗是復數,但不是相量,與時間沒有關系,由電路參數決定。
  相量是用來表示正弦量的復數。
  2、阻抗角j與電路的性質
  ――電路參數決定電路的性質
  阻抗角j是電壓超前于電流的角度。
  阻抗角j的正負決定了電路的性質:
  (1),電路呈感性,電壓超前電流角;
  (2),電路呈容性,電壓滯后電流角;
  (3),電路呈阻性,電壓、電流同相。
  特別:j=90°----純電感電路;j=-90°----純電容電路。

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