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（2)计算端口等效电阻R_ab.

A . 10 B . 3 C . -10 D . -3

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' />

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写出题1-5图所示各电路的U=f(I)和I=f(U)两种形式的端口特性方程. <img src='https://img2.soutiyun.com/ask/2020-10-09/971091757119769.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' />

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已知题9-4图所示电路中u_s=16√2sin(ωt+30°)V，电流表A的读数为5A。ωL=4Ω，求电流表A₁、A₂的读数。 <img src='https://img2.soutiyun.com/ask/2020-11-30/975592647422898.png' />

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' />

<img src='https://img2.soutiyun.com/ask/2020-08-23/967069484940068.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' />

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/2020-10-07/970927289819887.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-09/971091491072552.png' />

题1.26图所示电路中有几个结点？几条支路？已知R₁=R₂=4Ω,R₃=R₄=10Ω,U_s1=6V,U_s2=10V,U_s3=4V,U_s4=2V,求各支路电流。 <img src='https://img2.soutiyun.com/ask/2020-10-06/970864732065419.png' />

题7-31图所示电路中i_L(0_-)=0，R₁=6Ω，R₂=4Ω，L=100mH。求冲激响应i_L和u_L。 <img src='https://img2.soutiyun.com/ask/2020-09-02/967901420367103.png' />

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