如图所示电路,当R<sub>L</sub>分别为1Ω、2Ω和5Ω时,求其上电流I<sub>L</sub>分别为多少?<br /> <img src="https://nimg.ppkao.com/2019-07/wangjue/2019071516282915027.jpg?sign=2a83b53df560228db80f8ac73b577276&t=62e81aea" />
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A、如图所示电路为何种电路?当输入信号u<sub>ssub>与U<sub>csub>的波形如图所示时,画出u<sub>osub>在加电容C前后的波形。r /> rc="https://img.ppkao.com/2018-09/tangxueping/201809131005477043.jpg" />
A、如图所示电路中,u<sub>Ssub>=10sin314tV,R<sub>1sub>=2Ω,R<sub>2sub>=1Ω,L=637mH,C=637μF,求电流i<sub>1sub>,i<sub>2sub>和电压u<sub>csub>。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018092818010827576.jpg" />
A、R<sub>1sub>烧坏,R<sub>2sub>不会烧坏 B、R<sub>1sub>,R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏,R<sub>2sub>烧坏 D、R<sub>1sub>,R<sub>2sub>均未烧坏
A、如图所示电路,A点的电位V<sub>Asub>等于()。r /> rc="https://img.ppkao.com/2018-08/lina/2018083116230297754.jpg" />
A、图(a)所示电路中,电压源u<sub>Ssub>(t)的波形如图(b)所示。试求电流i<sub>Lsub>(t)。r /> rc="https://img.ppkao.com/2019-05/wangxuan/2019050616122288249.jpg" />
A、如图所示,已知u=U<sub>msub>sinωt V,R,X<sub>Lsub>,X<sub>Csub>,电容电流大于电感电流,试画出电路中电压、电流的矢量图。rc="https://img.ppkao.com/2018-09/wangjing/2018092909095681515.jpg" />
A、如图所示电路为何种放大电路?写出输出电压u<sub>osub>与输入电压u<sub>i1sub>、u<sub>i2sub>之间的关系式,并说明该电路的主要特点。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018091310091737907.jpg" />
A、电路如图P2.3所示,晶体管的b=80,=100Ω。分别计算R<sub>Lsub>=∞和R<sub>Lsub>=3kΩ时的Q点、A<sub>usub>、R<sub>isub>和R<sub>osub>。r /> rc="https://img.ppkao.com/2018-09/yuanhao/2018091014070277746.jpg" />