雨课堂学堂在线学堂云《Electric Circuits（昆明理大 ）》单元测试考核答案

注：不含主观题第1题填空题(2分)Theactualdirectionofcurrentisthedirectioninwhichthepositivechargemoves,whilethe____of

current

isarbitrarilyassumed.Whentheassumeddirectionisoppositetotheactualdirection,thecurrentvalueis____.正确答案：:["referencedirection"]正确答案：:["negative"]第2题填空题(2分)The____ofvoltageisthedirection

fromthehighpotentialpointtothelowpotentialpoint,andthereferencedirectionofvoltageisartificiallyspecified.Thevoltagevalueispositivewhenthereferencedirectionis____theactualdirection.正确答案：:["actualdirection"]正确答案：:["thesameof"]1.3Powerandenergy第1题单选题(1分)

Inthecircuitshowninfigure,IS＝10A

andUS＝12V,then(

).ABC第2题填空题(2分)Whenthereferencedirectionsofvoltageandcurrentofabrancharethesame,

the

productof____isthepowerofthebranch____.正确答案：:["voltageandcurrent"]正确答案：:["absorbed"]1.4(2)Circuitelements第1题单选题(1分)Inthecircuitshown,intermsofitsexternalcharacteristics,().AFigure2isequivalenttoFigure3.BFigure1isequivalenttoFigure4.CFigure1isequivalenttoFigure2.第2题单选题(1分)Inthecircuitshowninthefigure,thepowerabsorbedbycontrolledsourceis().A2WB4WC6WD8W第3题单选题(1分)Foranidealindependentcurrentsource,itsvoltageacross(

).Aonlydepends

onlyontheexternalcircuitandhasnothingtodowiththe

currentsourceBdepends

onthecurrentsourceitself

andhasnothingtodowiththe

externalcircuitCdepends

onthe

externalcircuitandcurrentsourceitselfDhas

nothingtodowiththatexternalcircuitandthecurrentsourceitself.第4题填空题(2分)Thevolt-amperecharacteristiccurveofidealvoltagesourceisastraightlineparallelling

tothe____axis,andthevolt-amperecharacteristiccurveoftheidealcurrentsourceisastraightlineparallelling

tothe____axis.正确答案：:["current"]正确答案：:["voltage"]2.1第1题单选题(1分)InthecircuitshowninFigure1-2,theportequivalentresistanceR=(

).A3ΩB8ΩC-2ΩD-5Ω第2题单选题(1分)

InthecircuitshowninFigure1-2,theportequivalentresistanceR

=(

).A3ΩB5ΩC7ΩD9Ω2.2Nodes,Branches,andLoops第1题填空题(3分)InthecircuitshowninFigure2-1,thecurrentsI1=____,I2=____,andthepowerfromthe4Vvoltagesource

P=____.正确答案：:["1A"]正确答案：:["3A"]正确答案：:["-12W"]2.3第1题单选题(1分)

Kirchhoff’sLawofVoltageandCurrentisrelatedto

circuit

().Anetworkstructure,notrelatedtocomponentpropertiesBnetworkstructureandcomponentpropertiesCcomponentsproperties,notrelatedtonetworkstructure第2题单选题(1分)Inthecircuitshown,

I1

=().A0.5AB－1AC2AD1A第3题填空题(2分)Forthe

circuitwithn

nodesandb

branches,

____independentKCLequationsand____KVLequations

canbelisted.正确答案：:["n-1"]正确答案：:["b-n+1"]2.4第1题填空题(3分)InthecircuitshowninFigure,

the

currentI1=____,I2=____,andthepowerfrom10Vvoltagesourceis____.正确答案：:["4A"]正确答案：:["2A"]正确答案：:["80W"]2.5(1)第1题单选题(1分)A15VB10C5VD0V第2题单选题(1分)ABCD第3题单选题(1分)Thecircuitisshowninthefigure.TheequivalentresistanceEQ1whenswitchSisopenedandclosedis().ABCD第4题单选题(1分)InthecircuitshowninFigure,thevoltageu

=(

).A1VB2VC3VD4V2.6(1)第1题单选题(1分)Theequivalentresistanceofthesingle-portnetworkshownbelowisequalto().ABCD第2题单选题(1分)Theequivalentresistanceofthe

portnetworkshowninthefigureis().ABCD第3题单选题(1分)AsshowninFigure,theinputresistanceofaportisequalto(

).A1.5ΩB2.5ΩC3.5ΩD4.5Ω第4题单选题(1分)

Inthecircuitshowninfigure,theresistancevalueofeachresistoris1Ω,thenRab=(

).A3ΩB2ΩC1ΩD0.5Ω第5题单选题(1分)AsshowninFigure,theequivalentcircuitofthesingle-portnetwork

is

(

).ABCD3.1第1题单选题(1分)

Ifyouwanttoknowallbranchvoltagesofacircuitwithnnodesandbbranches,youneedtomeasureatleast().ABCD第2题单选题(1分)Inthecircuitshowninthefigure,thehomingofnode①isequalto(

).ABCD第3题单选题(1分)In

thecircuitshowninFigure,thecurrenti=(

).A2AB3AC4AD5A第4题单选题(1分)

In

thecircuitshowninFigure,thenodevoltageequationof

nodecis(

).ABCD3.2第1题单选题(1分)ABCD第2题填空题(4分)InthecircuitshowninFigure,thenodevoltageu1=____,u2=____,u3=____,andbranchcurrent

i

=____.正确答案：:["5V"]正确答案：:["2V"]正确答案：:["7V"]正确答案：:["1.5A"]3.3第1题单选题(1分)If

acircuitwithnnodesandbbranches,needtobedetermined

thecurrentofallbranches,itwillbemeasuredatleast(

).ABCD3.4第1题填空题(3分)

InthecircuitshowninFigure,themeshcurrentsi1=____,i2=____,i3=____.正确答案：:["1.6A"]正确答案：:["0.8A"]正确答案：:["1A"]4.1第1题单选题(1分)InthecircuitshowninFigure,thecurrentI

=(

).A1AB2AC3AD4A4.2第1题填空题(2分)InthecircuitshowninFigure,ifthesuperpositiontheoremisusedtocalculate

thecurrenti,thecurrentgeneratedbythe1Acurrentsourceactingalone

i′=____，andthecurrentgeneratedbythe1Vvoltagesourceactingalone

i″=____.正确答案：:["1A"]正确答案：:["1A"]第2题单选题(1分)InthecircuitshowninFigure,whenthevoltageUab

iscalculatedby

thesuperpositiontheorem,theresponsesgeneratedby

5Vvoltagesourceand1Acurrentsourceare(

).A5V,8VB5V，-2VC0V,2VD0V,8V4.4第1题单选题(1分)Inthecircuitshownbelow,theopencircuitvoltageUOC

=().A15vB18vC16v第2题单选题(1分)InthecircuitshowninFigure,therelationshipoftheportu−iis(

)ABCD第3题单选题(1分)InthecircuitshowninFigure,theopencircuitvoltageattheabterminal

Uab=().A10VB5VC0D-5V4.5第1题填空题(2分)

Forexternalcircuits,oneportcomposedofanindependentpowersupply,alinearresistorandacontrolledsourcecanbeequivalently

replacedbyaparallelconnectionof____andresistor.Theresistance

isequalto____afterallindependentpowersuppliesinoneportaresettozero正确答案：:["currentsource"]正确答案：:["inputresistance;equivalentresistance"]4.6第1题单选题(1分)

InthecircuitshowninFigure,themaximumpowerof

theresistoris().A1WB2WC4WD0.5W5.2第1题单选题(1分)Theinputresistance

Rabofthecircuitshown

inthefigure

is().AR1BR1+R2CR1+R2R3R2+R3DR1+R35.3第1题单选题(1分)A0VB-10VC10VDnoneoftheabove第2题单选题(1分)A25VB-25VC-30VD30V第3题单选题(1分)A-1B1C2D3第4题单选题(1分)A0BUsC−UsD

alloftheabove第5题单选题(1分)AUsB−UsC0Dinfinit第6题单选题(1分)A200ΩB500ΩC2kΩD5kΩ第7题单选题(1分)A5Ω,4VB5Ω,-4VC10Ω,

-4VD10Ω,

4第8题单选题(1分)A-2V,∞B2V,

∞C

2V,0ΩD-2V,0Ω6.1第1题填空题(2分)Beforeandafterthecircuitchange,whenthecapacitorcurrentis____thecapacitor____willnotjumpatthemomentofthecircuitchange.正确答案：:["finitevalue"]正确答案：:["voltage"]第2题单选题(1分)AB2AC1AD0第3题单选题(1分)WhenthecircuitshowninFigureisstable,theenergystorageof1Fcapacitoris(

).A1JB2JC4JD8J6.2第1题单选题(1分)ABCD6.3第1题填空题(2分)Inastabledirectcurrentcircuit,inductanceisequivalentto____,andcapacitanceisequivalentto____.正确答案：:["shortcircuit"]正确答案：:["opencircuit"]第2题单选题(1分)AB20VC10VD06.4第1题填空题(2分)WhenthecircuitshowninFigureisstable,theenergystorageof1Hinductoris____,andthatof0.5Fcapacitoris____.正确答案：:["2J"]正确答案：:["4J"]7.1第1题填空题(2分)Thethreecomponentsofthefirst-orderdynamiccircuitare____,____,andsteady-stateresponse.正确答案：:["initialconditions"]正确答案：:["timeconstant"]7.2第1题单选题(1分)Whendynamiccircuitswitching,ifthecapacitorcurrentandinductorvoltagebeforeandafterswitchingarelimitedvalues,thenthereare()beforeandafterswitching.ABCD第2题单选题(1分)ABCD第3题单选题(1分)InthecircuitshowninFigure,thetimeconstant

τ=(

).A0.5sB1sC2sD4s第4题单选题(1分)A0.5sB1sC2sD4s7.4第1题单选题(1分)ABCD8.1第1题填空题(2分)Thethreecomponents

ofsinusoidalquantityare____

angularfrequency(orfrequency)and____.正确答案：:["amplitude;effectivevalue"]正确答案：:["initialphaseangle"]8.2第1题单选题(1分)A1AB2AC0.5AΩD0.866A8.3第1题单选题(1分)ABCD第2题单选题(1分)ABCD8.4第1题单选题(1分)ACapacitiveBInductiveCResistiveD0value第2题单选题(1分)A45°B90°C-90°D-45°8.5第1题单选题(1分)A15VB7VC5VD3V第2题填空题(2分)InRLCseriesresonantcircuit,theinductorvoltageis____timesasmuchastheportvoltage;theRMSvalueofthe

capacitorvoltageisequaltothat

oftheinductorvoltage,butthephaseis____.正确答案：:["Q"]正确答案：:["converse"]第3题单选题(1分)A4AB8AC10AD16A8.6第1题单选题(1分)InthecircuitshowninFigure

,whentheangularfrequencyofthesinusoidalsignaladdedtotheabterminalis(),theabterminalisequivalenttoashortcircuit.ABCD第2题单选题(1分)ABCD第3题单选题(1分)ABCD第4题单选题(1分)AsensibilityBcapacitiveCresistivityDunsure第5题单选题(1分)Alow-passfilteringcharacteristicsBhigh-passfilteringcharacteristicsCbandpassfiltercharacteristicsDbandstopfiltercharacteristics9.1第1题填空题(2分)Inthesinusoidalsteady-statecircuit

showninFigure,thereading(effectivevalue)oftheammeterA1

shouldbe

____,andthereading(effectivevalue)oftheammeterA2

shouldbe____.正确答案：:["5A"]正确答案：:["3A"]9.2第1题单选题(1分)ABCD第2题单选题(1分)ABCD第3题单选题(1分)ABCD第4题填空题(3分)Inthesinusoidalsteady-statecircuitshowninFigure,

giventhat,us=102coswt(V).Inordertomaximizethermsvalueofcurrenti,theeffectivefrequency

ω

ofthepowersupplyshouldbe____.Atthistime,thermsvalueI

ofcurrenti

is____,andtheaveragepoweremittedbythepowersupplyis____.正确答案：:["10rad/s"]正确答案：:["5A"]正确答案：:["50W"]第5题填空题(3分)Inthesinusoidalsteady-statecircuitshowninFigure,

giventhat,

thentheRMSvalueofcurrentI1=____,theRMSvalueofcurrentI2=____,andtheaveragepowergeneratedbythevoltagesourceP=___