专业英语复习题

专业英语复习题

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时间:2019-08-04

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1、1、Chargeisanelectricalpropertyoftheatomicparticlesofwhichmatterconsists,measuredincoulombs。2、Wealsoknowthatthechargeeonanelectronisnegativeandequalinmagnitudeto1.60210×10--19Cwhileaprotoncarriesapositivechargeofthesamemagnitudeastheelectron3.、Auniquefeatureofelectricchargeorelectri

2、cityisthefactthatitismobile;thatis,itcanbetransferredfromoneplacetoanother,whereitcanbeconvertedtoanotherformofenergy.4、Althoughwenowknowthatcurrentinmetallicconductorsisduetonegativelychargedelectrons,wewillfollowtheuniversallyacceptedconventionthatcurrentisthenetflowofpositivecha

3、rges.5、ThewaywedefinecurrentasiinEq.(1-l)suggeststhatcurrentneednotbeaconstant-valuedfunction,chargecanvarywithtimeinseveralwaysthatmayberepresentedbydifferentkindsofmathematicalfunctions.6、Thevoltageuabbetweentwopointsaandbinanelectriccircuitistheenergy(orwork)neededtomoveaunitcha

4、rgefromatob。7、Thepowerabsorbedorsuppliedbyanelementistheproductofthevoltageacrosstheelementandthecurrentthroughit.8、Anidealindependentsourceisanactiveelementthatprovidesaspecifiedvoltageorcurrentthatiscompletelyindependentofothercircuitvariables.9、Thesymbolforavoltagesourcehavinguv

5、oltsacrossitsterminalsisshowninFig.1-4(a).10、Anothersymbolthatisoftenusedforaconstantvoltagesource,suchasabatterywithUvoltsacrossitsterminals,isshowninFig.1-4(b).11、WemightobserveatthispointthatthepolaritymarksonFig.1-4(b)areredundantsincethepolaritycouldbedefinedbythepositionsofth

6、elongerandshorterlines.12、Thusifuisthevoltageacrossthesourceanditscurrentiisdirectedoutofthepositiveterminal,thenthesourceisdeliveringpower,givenbyp=ui,totheexternalcircuit.13、Sincethecontrolofthedependentsourceisachievedbyavoltageorcurrentofsomeotherelementinthecircuit,andthesourc

7、ecanbevoltageorcurrent,itfollowsthattherearefourpossibletypesofdependentsources,namely:14、Itshouldbenotedthatanidealvoltagesource(dependentorindependent)willproduceanycurrentrequiredtoensurethattheterminalvoltageisasstated,whereasanidealcurrentsourcewillproducethenecessaryvoltageto

8、ensurethestatedcurrentflow

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