在习题9.4图所示的滤波电路中,C₁=C₂=10uF,在频率f=1000Hz下,欲使输出电压U₂为输入电压U1的1/10,求此时扼流圈的自感L.

电路如习题4-5图所示，其中R=2Ω，L=1H，C=0.01F，u_C=0，若电路的输入电流为 <img src='https://img2.soutiyun.com/ask/uploadfile/5361001-5364000/1dc19a2e7111fdeba57ad82a24868489.png' />

在题1.2图所示的RLC串联电路中，己知<img src='https://img2.soutiyun.com/ask/2020-12-23/977600078082618.png' />求i、u_R和u_L。 <img src='https://img2.soutiyun.com/ask/2020-12-23/977600113222628.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-29/978118636637367.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-07/970927824241454.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-31/967720818304797.png' />

练习题4-12图所示电路;(1)试求单口网络N₂的等效电阻;(2)求出当N₂与N₁相连时的端口电压u₂;(3)试用置换定理求电压u_o。 <img src='https://img2.soutiyun.com/ask/2020-08-24/967136830775237.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-17/969200956020412.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-06/970864204274231.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-10/9711752938202.jpg' />

电路如练习题8-12图所示，已知u_s=100cos(20t)V。 (1)计算<img src='https://img2.soutiyun.com/ask/2020-08-28/967470801948578.png' /> (2)绘相量图表面(1)中各相量; (3)求<img src='https://img2.soutiyun.com/ask/2020-08-28/967470841053815.png' />的相位关系; (4)写出i、u_ab、u_bc及u_cd。 <img src='https://img2.soutiyun.com/ask/2020-08-28/96747081020605.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-07/970928095949995.png' />

在题6.8图所示电路中,求开关S闭合瞬间t(=0)电路小的电压u_C、u_L。 <img src='https://img2.soutiyun.com/ask/2020-10-07/970927159291421.png' />

s(t)波形如下图所示,试画出其通过匹配滤波器后的输出波形s_o(i),并求S_o(1)出现最大值的时刻和最大值。 <img src='https://img2.soutiyun.com/ask/2020-09-03/968013231187445.png' />

电路如题6-17图所示，在t＜0时.电路已处于稳态，t=0时开关S由1端接至2端，求t＞0时的电容电压u_c(t)。 <img src='https://img2.soutiyun.com/ask/2020-08-20/966785880595594.png' />

题7-27图所示电路中，已知i_S=10e(t)A，R₁=1Ω，R₂=2Ω，C=1μF，u_C(0-)=2V，g=0.25s。求全响应i₁(t)、i_C(t)、u_C(t)。 <img src='https://img2.soutiyun.com/ask/2020-09-02/967900598791111.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-01/967816497405726.png' />

<img src='https://img2.soutiyun.com/ask/2020-09-01/96781572451352.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-07/970927289819887.png' />

电路如练习题8-13图所示，已知i_s(t)=cos(t+90°)A，试求稳态电压u(t)，并绘相量图。 <img src='https://img2.soutiyun.com/ask/2020-08-28/967470947804921.png' />

题11-9图所示电路为RC并联电路，己知i_s(t)=ε(t)，用运算法求u_c(t)和i_c(t)。 <img src='https://img2.soutiyun.com/ask/2020-08-21/966853923134676.png' />

练习题6-5图所示RL电路，已知u_s(t)=12e(t)V试求阶跃响应i_L、u₁和u。 <img src='https://img2.soutiyun.com/ask/2020-08-25/967204134099058.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-10/971186081955246.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-07/97092736294907.png' />

电路如题10-1图所示,已知<img src='https://img2.soutiyun.com/ask/2020-08-21/966851847824976.png' />:求电容电流i_c. <img src='https://img2.soutiyun.com/ask/2020-08-21/966851861353749.png' />