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1、第一章电路的基本概念和基本定律1.1在题1.1图中,各元件电压为U1=-5V,U2=2V,U3=U4=-3V,指出哪些元件是电源,哪些元件是负载?解:元件上电压和电流为关联参考方向时,P=UI;电压和电流为非关联参考方向时,P=UI。P>0时元件吸收功率是负载,P<0时,元件释放功率,是电源。本题中元件1、2、4上电流和电流为非关联参考方向,元件3上电压和电流为关联参考方向,因此P1=-U1×3=-(-5)×3=15W;P2=-U2×3=-2×3=-6W;P3=U3×(-1)=-3×(-1)=3W;P4=-U4×(-4)=-(-3)×(-4)=-12W。元件2、4是电源,元件1、3是负载。1.
2、2在题1.2图所示的RLC串联电路中,已知求i、uR和uL。解:电容上电压、电流为非关联参考方向,故电阻、电感上电压、电流为关联参考方向1.3在题1.3图中,已知I=2A,求Uab和Pab。解:Uab=IR+2-4=2×4+2-4=6V,电流I与Uab为关联参考方向,因此Pab=UabI=6×2=12W1.4在题1.4图中,已知IS=2A,US=4V,求流过恒压源的电流I、恒流源上的电压U及它们的功率,验证电路的功率平衡。解:I=IS=2A,U=IR+US=2×1+4=6VPI=I2R=22×1=4W,US与I为关联参考方向,电压源功率:PU=IUS=2×4=8W,methodsofthepo
3、kervibratorvibrating,steelreinforcementinFoundationpitWestofasteelprocessingplantconcentratesproductiontemplatesusinglargepiecesofshapedsteelformworkandbambooglueformworkmethods.Bridgejackingof500thydraulictoppicks,roofiscomplete,edgeanglewall,railing,cablechannel,u-channelandotherancillaryworkscons
4、truction.3.1.4.theconstructionprocess(seetheconstructionprocessflowchart)constructionprocessflowchart3.2.constructionsitelayout3.2.1.constructionsitelayout1,layoutaccordingtotheconstructiondesignrequirement,FoundationplacedintheNorthoftheline.ConstructionsitelayoutasshowninFigure1.constructiongenera
5、llayout.2,temporaryworkscombinedwiththedevotedsectionpersonnelandmachineryequipment,theactualsituation,inaccordancewiththespecificationrequirements,establishedinthesitelayoutconstructionandmanagementrequiredfromnear,andtomeetthenormalproductionandlifeintheOffice,housingandsteelprocessingfacilities,w
6、arehouseandstorageandthetemplatefield,andfirefacilitiesasrequired.Separationofworkzones,workarea,livingareasettings,andsetwallclosed.3,constructionwaterwaterinsitudewateringwells,watertanksandbottledwater.4,theconstructionofelectricitygiventhisprojectofweldedsteelandconcreteconstructionU与I为非关联参考方向,电
7、流源功率:PI=-ISU=-2×6=-12W,验算:PU+PI+PR=8-12+4=01.5求题1.5图中的R和Uab、Uac。解:对d点应用KCL得:I=4A,故有RI=4R=4,R=1ΩUab=Uad+Udb=3×10+(-4)=26VUac=Uad-Ucd=3×10-(-7)×2=44V1.6求题1.6图中的U1、U2和U3。解:此题由KVL求解。对回路Ⅰ,有:U1-10-6=0,U1=16