试求题1-3图所示部分电路中的电压U_af、U_ag、U_ab和电流I_ad.

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<img src='https://img2.soutiyun.com/ask/2020-10-07/9709100477967.png' />

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

<img src='https://img2.soutiyun.com/ask/2021-01-05/978704111515359.png' /><img src='https://img2.soutiyun.com/ask/2021-01-05/978704176869097.png' />

A．U_S=-60V B． U_S=-70V C． U_S=-80V D． U_S=-90V

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

试求题4-25图所示电路中电容电压u_c(t)在t＞0时的函数式.已知u_c(0_)=80V. <img src='https://img2.soutiyun.com/ask/2020-10-09/971120741399575.png' />

在题5-12图所示电路中,若电流i(t)=1sin314tA,试求电压u_R(t)、u_L(t)、u_c(t)和u(t),并绘出波形图和相量图. <img src='https://img2.soutiyun.com/ask/2020-10-10/971172831541366.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' />

在题5-7-5图所示的电阻电感串联电路中,若电流i(t)=0.8Ssin314t A,试求电压u_R(t)、u_L(t)和u(t),并绘出波形图和相量图. <img src='https://img2.soutiyun.com/ask/2020-10-10/971171923335419.png' />

对于题1-19图所示电路,(1)当端口电压U_ab=50V时,求输出电压<img src='https://img2.soutiyun.com/ask/2020-10-09/971093340927358.png' /><img src='https://img2.soutiyun.com/ask/2020-10-09/971093352207003.png' />(2)计算端口等效电阻R_ab. <img src='https://img2.soutiyun.com/ask/2020-10-09/971093371271093.png' />

在原教材图16.2.7所示的差动运算电路中,<img src='https://img2.soutiyun.com/ask/2020-10-06/970865669582042.png' /><img src='https://img2.soutiyun.com/ask/2020-10-06/970865681905746.png' />,试求;输出电压u_o. <img src='https://img2.soutiyun.com/ask/2020-10-06/970865705847116.png' />

电路如题1-11图所示，试求(1)图(a)中电流i₁和电压u_ab;(2)图(b)中电压u_cb。 <img src='https://img2.soutiyun.com/ask/2020-08-20/966768174350855.png' /><img src='https://img2.soutiyun.com/ask/2020-08-20/966768181740278.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-23/967072228995764.png' />

试求题4-27图所示电路在开关闭合后的零状态响应i(t)(图中Us为一直流电压). <img src='https://img2.soutiyun.com/ask/2020-10-09/971121216666759.png' />

试求题9-12图所示电路的零状态响应i₁(t)和i₂(t). <img src='https://img2.soutiyun.com/ask/2020-10-10/971200443931704.jpg' />

求题4-3-1图所示电路的冲徼响应u_c(t)和i(t),并用阶跃响应的导数对所求结果予以校验. <img src='https://img2.soutiyun.com/ask/2020-10-09/971117740183915.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' />

<img src='https://img2.soutiyun.com/ask/2020-10-11/971295964907616.jpg' />

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' />

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已知题9-14图所示电路中的电压源为正弦量，L=ImH，R₀=1kΩ，Z=(3+j5)Ω。试求： <img src='https://img2.soutiyun.com/ask/2020-09-04/96807621414959.png' /> (1)i₀=0时，C值为多少？ (2)当条件(1)满足时，试证明输入阻抗为R₀。