电气工程及其自动化专业英语.docx

电气工程及其自动化专业英语电气工程及其自动化专业英语应该注意：一个理想电压源(独立或受控)可向电路提供任意电流以保证其端电压为规定值，而电流源可向电路提供任意电压以保证其规定电流。Adifferentclassofrelationshipoccursbecauseoftherestrictionthatsomespecifictypeofnetworkelementplacesonthevariables.Stillanotherclassofrelationshipisonebetweenseveralvariablesofthesametypewhichoccursastheresultofthenetworkconfiguration,i.e.,themannerinwhichthevariouselementofthenetworkareinterconnected.一种不同类型的关系是由于网络元件的某种特定类型的连接对变量的约束。另一类关系由于网络结构，即网络的'不同元件互相连接的方式所产生的相同形式的一些变量间的关系。1.Aresistorwhoseresistancesvarywithitscurrentisknownasanonlinearresistor.2.Anopencircuitisacircuitelementwithresistanceapproachinginfinity.3.3.Anelectricheaterdraws10Aforma120Vline.Theresistanceoftheheateris12Ω.4.Anidealdependentsourceisanactiveelementinwhichthesourcequantityiscontrolledbyanothervoltageorcurrent.5.Anindependentvoltagesourceisatwo-terminalelement,whichmaintainsaspecifiedvoltagebetweenitsterminals.6.Accordingtothepassivesignconvention,ifthepowerhasaplussign,powerisabsorbedbytheelement.7.Electriccurrentisthetimerateofcharge,measuredinamperes.8.ForacircuitcontainingNnodesandMbranches,therewillbeN-1independentnodevoltage.9.Foravoltagesource,itsterminalvoltageisknownbutitscurrentmustbedeterminedbytheexternalcircuitconnectingwithit.10.Ifinanacbphasesequence,Uan=100∠-20°,thenUbnis100∠100°.11.Itisconventionaltotakethecurrentflowasthemovementofpositivecharges.12.Kirchhoff’slawsarethatarebasedonthetopologyofthenetwork.13.Kirchhoff’scurrentlawcanbestatedintwoways.14.Kirchhoff’scurrentlawisbasedonthelawofconservationofcharge.15.Kirchhoff’svoltagelawisbasedonthelawofconservationofenergy.16.MeshanalysisappliesKVLtofindunknowncurrentswhicharemeshcurrents.17.NodalanalysisisbasedonasystematicapplicationofKCL,andsatisfiesautomaticallyKVL.18.Nodalanalysismethodischoosingnodevoltagesascircuitvariables.19.Ohm’slawstatesthatthevoltageacrossaresistorisdirectlyproportionaltothecurrentflowingthroughtheresistor.20.Resistorsarepassiveelements.21.Theplus(+)andminu