电路如题图4-38所示。当受控源的转移电流比a=1、2、3时，计算电流i1和i。

A . 1 B . -1 C . 2 D . -2

A . 1点 B . 2点 C . 3点 D . 4点

A . 100 B . -100 C . 50 D . -50

&nbsp;&nbsp;<img src="https://img2.soutiyun.com/ask/uploadfile/5466001-5469000/1895d41346cfdadd86f232397d16ef90.png"/>

是 否

<img src='https://img2.soutiyun.com/ask/2020-03-10/952731741203262.jpg' />

如题图E3-19所示电路，已知<img src='https://img2.soutiyun.com/ask/2020-11-14/974193896718043.png' />试求电流i。 <img src='https://img2.soutiyun.com/ask/2020-11-14/974193908480716.png' />

A．0.8A B．1.2A C．0.2A D．0.4A

电路如题图5-7所示，已知电源电压为正弦电压，电流I₁=I₂=10A，试<img src='https://img2.soutiyun.com/ask/2021-01-03/978529327380181.png' />和<img src='https://img2.soutiyun.com/ask/2021-01-03/978529340109909.png' />，设<img src='https://img2.soutiyun.com/ask/2021-01-03/978529340109909.png' />的初相角为零。 <img src='https://img2.soutiyun.com/ask/2021-01-03/978529357270891.png' />

试证明题图13-17(a)所示耦合电感的电压电流关系，在k=1和L1变为无穷大时，会变成题图13-17(b)所示理想变压器的电压电流关系。 <img src='https://img2.soutiyun.com/ask/2020-07-08/963047437573226.png' />

试写出题图12-4(a)、(b)所示双口网络的转移电流比，并用计算机程序画出电阻R=1kΩ和电容C=1μF时电路的幅频特性曲线。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962979932609709.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962979942033248.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962979947940586.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962979953660913.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962979959421242.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962879421477751.png' />

<img src='https://img2.soutiyun.com/ask/2020-06-29/96227380449508.jpg' />

题图14-5所示电路中，已知uc(0)=-2V，iL(0)=0.6A，试求t≥0时的电容电压uc(t)和电感电流iL(t)的零输人响应。 <img src='https://img2.soutiyun.com/ask/2020-07-08/963048132138953.png' /><img src='https://img2.soutiyun.com/ask/2020-07-08/963048150707015.png' /><img src='https://img2.soutiyun.com/ask/2020-07-08/963048171235189.png' />

题图8-9所示电路中，开关在a点为时已久，t=0时开关倒向b点，试求t≥0时的电容电压uC(t)和电感电流iL(1)。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962962293498809.png' />

电路如题图5-8所示，已知R₁=10Ω，C=10³μF，R₂=0.5Ω，ω=1000rad/s，<img src='https://img2.soutiyun.com/ask/2021-01-03/978529389968761.png' />求当电流有效值I最大时，电感L为何值？ <img src='https://img2.soutiyun.com/ask/2021-01-03/978529403802552.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-07/96296198823835.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962894620121064.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/17868001-17871000/17868863/2015110209404832241.jpg' /> A．1 B． -1 C． 2 D． -2

<img src='https://img2.soutiyun.com/ask/2020-07-07/96296176778574.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961778526355.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961788372918.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962879455986725.png' />

单相桥式整流电容滤波电路如题图E9-2所示，变压器:二次电压<img src='https://img2.soutiyun.com/ask/2020-11-14/97419657881545.png' />求 (1)负载电流I₀，每个二极管的平均电流ID，二极管承受的反向峰值电压U_DRM; (2)当DI管发生短路时的负载电流I₀，D4管的电流I_D4; (3)当DI管发生虚焊断路时的负载电流I₀，D4管的电流I_D4。 <img src='https://img2.soutiyun.com/ask/2020-11-14/974196590724131.png' />

图4-62所示反馈电路,其中Kv₂(t)是受控源. <img src='https://img2.soutiyun.com/ask/2020-12-01/975677012951046.png' /> (1)求电压转移函数<img src='https://img2.soutiyun.com/ask/2020-12-01/975676999926301.png' /> (2)K满足什么条件时系统稳定？