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),

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' />

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(1)S1闭合,S2断开;(2)S1断开,S2闭合. <img src='https://img2.soutiyun.com/ask/2020-10-10/971180253439874.jpg' />

在题2．27图所示电路中，对称负载连成三角形，已知电源电压UL=220 V，各电流表读数均为38 A。试求(1)当B线断开时，图中各电流表的读数；(2)当AC相负载断开时，图中各电流表的读数。 <img src='https://img2.soutiyun.com/ask/uploadfile/10374001-10377000/b1d6841abcf8b603feda441232220fc4.jpg' />

如题5-12图所示RLC电路，己知Us(t)=5ω(t)，i(0)=2A, u(0 )=2V。试用S域方法求全响应U(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-10/963223214157704.png' />

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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' />

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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' />

图3-19所示电路中开关S1在t=0时闭合，开关S2在t=1s时闭合，试用阶跃函数表示电流i(t)。 <img src='https://img2.soutiyun.com/ask/uploadfile/5493001-5496000/006c63b713099b96077658762cacfaf9.png' />

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题5.6图所示电路已处于稳态，当t=0时开关S由a切换至b，求t≥0时电流i₂(t)，并画出波形图。 <img src='https://img2.soutiyun.com/ask/2020-09-17/969188809236656.png' />

题3.19图所示电路己处于稳态，当t=0时开关S由a切换至b，求t≥0时的电流i(t)和电压uR(t)。 <img src='https://img2.soutiyun.com/ask/2020-09-17/969183881171787.png' />

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