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感生电动势大小分析

感生电动势大小分析. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. d. a. V. B. V. d. a. V. B. V. d. V. a. B. V. a. d. V. B. V. a. d. V. B. V. a. d. V. B. V. a.

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感生电动势大小分析

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  1. 感生电动势大小分析

  2. V a d V B

  3. V a d V B

  4. V a d V B

  5. V a d V B

  6. V a d V B

  7. V a d V B

  8. V a d V B

  9. V a d V B

  10. V d a V B

  11. V d a V B

  12. V d V a B

  13. V a d V B

  14. V a d V B

  15. V a d V B

  16. V a d V B

  17. V a d V B

  18. V ωt a 中性面 d V B 线圈平面 ωt

  19. 从中性面开始转动，角速度是ω ，经过时间t，线圈转过的角度是ωt ，ab边的线速度v的方向跟磁感线的夹角也是ωt.ab边的长度为lab,则ab边中的感应电动势是： V ωt a 中性面 d V 线圈平面 B V=ωad/2 ωt V//=Vsinωt eab=Blabvsinωt

  20. 2.大小变化规律------电动势的瞬时值 cd边中的感应电动势跟ab边中的大小相同，而且两边又是串联的，所以线圈中总感应电动势为 eab=2Blvsinωt 令 Em=2Blv=BSω 叫电动势的最大值 线圈的电动势的瞬时值：e=Emsinωt

  21. E r S R • 把线圈的电阻组成闭合电路，电路中就有感应电流，实验证明，在只含有电阻的电路中，适用于直流电路的欧姆定律也适用于交流电路。其等效电路图如右： 设闭合电路的总电阻为R，则 电流的瞬时值：i=e/R =Emsimωt/R 得: i=Imsinωt Im=Em/R 这时电路某一段上电压同样是按正弦规律变化的， 电压的瞬时值：u=iR=Imsinωt R 得: u=Umsinωt Um=ImR

  22. 这种按正弦规律变化的交流电（电动势e、电流i、电压u)叫正弦交流电。这种按正弦规律变化的交流电（电动势e、电流i、电压u)叫正弦交流电。 表达式： e=Emsinωt Em叫电动势的最大值 i=Imsinωt Im叫电流的最大值 u=Umsinωt Um叫电压的最大值

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