范世贵主编《电路基础》答案第十章非正弦周期电流电路.doc

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1、窗体顶端           第十章                         非正弦周期电流电路与信号的频谱窗体底端10-1  已知A.。求    及i(t)的有效值I。　　答案    解：                 ，                   　                　                                    　                 　                                         　           。　　 10-2 图题10-2图示电路，。求及其有效值。　答案

2、      解：（1）单独作用：   。          （2）单独作用：                      ,,                                                                                　                       　         （3）单独作用：                                                                                                             

3、                 　           故                                　    10-3   已知电路，。求          及其有效值。　　答案     解：（1）单独作用时：                            ,        （2）单独作用时：                                            （3）单独作用时：                                                 即发生了并联谐振，故      （4）单独作用时    

4、                                         即电路对第九次谐波发生串联谐振。               　                          故                         　10-4图题10-4，求图示电压u(t)的有效值U。      　答案 解：u(t)在一个周期内的表达式为　                        　　          故　10-5    有效值为100V得正弦电压加在电感L两端，得电流10安。当电压中还有三次谐波时，其有效值认为100V，得电流为8安。求此电压的基波和 

5、     三次谐波电压的有效值。　　答案       解：　                     　                             ①                     ②             ③             ④       联解得。10-6     图题10-5电路，u(t)波形如图所示，T=6.28微秒。求i(t)和。   　答案      解：。        故，                                    　         故       故                         

6、                              故                        10-7      图题10-7，图示为一种滤波器电路伏，亨，。欲使伏，问            、的值。　　        答案       解：                                            联解得  10-8   图题10-8，图示电路，已知。欲使，求、的值。　答案          解：                                                               联解得  10

7、-9   图题10-9，图示单口网络N的端电压和端电流分别为,求：      (1)各分量频率时网络N的输入阻抗；（2）网络N吸收的平均功率。　            答案       解：（1）                                                           　           （2）