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ID:51780486
大小:1.20 MB
页数:18页
时间:2020-03-08
《电工电子专业英语 教学课件 作者 徐红梅 Unit3,4.pptx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ExercisesⅠ.Answerthefollowingquestions.1.WhatdoesPDstandfor?2.Whatistheunitofvoltage?3.Howtomeasurethepotentialdifferenceofacomponent?4.What?sthesymbolofPD?5.Whatwillhappenwhenthevoltageisappliedacrossacircuit?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,if
2、not,say“False”.1.TheunitofPDisAmpere.2.ElectronsareforcedthroughacircuitbythevoltageorPD.3.Whenthevoltageisappliedtoanelectricalconductor,electricalchargesflowintheconductor.4.Thepotentialdifferenceofacomponentcanbemeasuredbyanymeter.5.PDisalsocalledcurrent.Ⅲ.Translatethefollowingsent
3、encesintoChinese.1.PDstandsforpotentialdifference.2.ElectronsareforcedthroughacircuitbythevoltageorPD.3.Thepotentialdifferenceofacomponentcanbemeasuredbyavoltmeter.4.Aseachcoulombofchargetravelsthroughthevariouscomponentsinacircuit,alltheenergyisconvertedintootherforms.5.Itmaybeobtain
4、edbyseveralways.ExercisesⅠ.Answerthefollowingquestions.1.Whatiscurrent?2.Arethereanyfreeelectronsinconductors?3.What?sthedirectionofcurrent?4.What?stheunitofcurrent?5.What?sthesymbolofcurrent?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,ifnot,say“False”.1.T
5、hedriftofelectronsishaphazard.2.Thedirectionoftheflowofnegativechargeisusuallyregardedasthedirectionofcur-rent.3.Ifavoltageisappliedacrossaconductor,therewillbeacurrentflowinit.4.CurrentisrepresentedbythesymbolU.5.CurrentiscommonlymeasuredinAmperes.Ⅲ.Translatethefollowingsentencesinto
6、Chinese.1.Ifacellisconnectedacrossthewire,theelectronswillflowfromthenegativetothepositiveterminal.2.CurrentisrepresentedbythesymbolI.3.Therearetwokindsofcurrent:DirectCurrent(DC)andAlternatingCurrent(AC).4.Currentisthedirectionalflowofelectrons.5.Undernormalcircumstances,therearealar
7、genumberoffreeelectronsinconductors,butthedriftofelectronsishaphazard.
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