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学术英语理工第二版王健燕答案1.Itisconventionaltotakethecurrentflowasthemovementof.（）[单选题]A.negativechargesB.positivecharges(正确答案)C.anychargeD.protons2.Electriccurrentisthetimerateofcharge,measuredin.（）[单选题]A.wattsB.voltsC.joulesD.amperes(正确答案)3.Theenergyrequiredtomoveaunitchargethroughanelementis.（）[单选题]A.currentB.powerC.voltage(正确答案)D.potential4.Theplus(+)andminus(-)signsinanelectriccircuitdiagramareusedtodefine.（）[单选题]A.voltagepolarity(正确答案)B.currentdirectionC.powerflowD.absorbedpower5.Accordingtothepassivesignconvention,ifthepowerhasaplussign,poweris()bytheelement.()[单选题]A.suppliedBabsorbed(正确答案)C.generatedD.transferred6.Anindependentvoltagesourceisa(),whichmaintainsaspecifiedvoltagebetweenitsterminals.（）[单选题]A.one-terminalelementB.two-terminalelement(正确答案)C.three-terminalelementD.four-terminalelement7.Resistorsare()elements.（）[单选题]A.passive(正确答案)B.activeC.independentsourceD.dependentsource8.Anidealdependentsourceisan()elementinwhichthesourcequantityiscontrolledbyanothervoltageorcurrent.（）[单选题]A.passiveB.active(正确答案)C.independentD.inductive9.Thereare()possibletypesofdependentsources.（）[单选题]A.twoB.threeC.four(正确答案)D.five10.Foravoltagesource,itsterminalvoltageisknownbutits()mustbedeterminedbytheexternalcircuitconnectingwithit.（）[单选题]A.electromotiveforceB.current(正确答案)C.controlcoefficientD.polarity11.Thecircuitelementusedtomodelthecurrent-resistingbehaviorofamaterialis.（）[单选题]A.thecapacitorB.theinductorC.theresistor(正确答案)D.thedependentsource12.Ohm'sLawstatesthatthevoltageacrossaresistoris()thecurrentflowingthroughtheresistor.（）[单选题]A.equaltoB.directlyproportionalto(正确答案)C.inverselyproportionaltoD.differentfrom13.Aresistorwhoseresistancesvarywithitscurrentisknownas.（）[单选题]A.alinearresistorB.aconstantresistorC.anonlinearresistor(正确答案)D.atime-varyingresistor14.()isacircuitelementwithresistanceapproachinginfinity.（）[单选题]A.Anope
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