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1、ExercisesⅠ.Answerthefollowingquestions.1.WhatisOhm’sLaw?2.Whatiscurrent?3.WhatdoesRstandsfor?4.WhatdoesPstandsfor?5.Whatistheunitofpower?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,ifnot,say“False”.1.Rstandsforvoltagewhichisapotentia
2、ldifference.2.Iiscurrent,thatistheflowofelectrons.3.Conductorslikeresistorsandcapacitorsresisttosomedegreetheflowofcurrent.4.TheunitofcurrentisWatt.5.Thepowerofanalternatingcurrentisitsvoltagemultipliedbycurrent.Ⅲ.TranslatethefollowingsentencesintoChinese.1.Ohm?
3、sLawisamathematicalexpressionoftherelationshipbetwe-envoltage,currentandresistance.2.Currentisthequantityofchargepassingagivenpointinaunitoftimeinacircuit.3.Conductorslikeresistorsandcapacitorsresisttosomedegreetheflowofcurrent.4.Theworkperformedbyanelectricalcu
4、rrentinaunitoftimeiscalledpower.5.Thepowerofadirectcurrentisitsvoltagemultipliedbycurrent.Notestothetext1.Aninductorisanelectricaldevice,whichopposesachangeinelectricalcurrent.注:句中which引导非限定定语从句,先行词是electricaldevice.译:电感是阻碍电流变化的电装置。2.Resistanceoffersanopposition
5、toallcurrentflowwhileinductanceonlyoffersanop-positiontonon-constantcurrentflow.注:此句中while引导状语从句,译作“而……”。译:电阻对所有的电流都产生阻碍作用,而电感只对有变化的电流产生阻碍作用。ExercisesⅠ.Answerthefollowingquestions.1.Whatisaninductor?2.Whatistheunitofinductance?3.Whatareinductorsusedfor?4.Whatisi
6、nductance?5.Therearetwotypesofinductors,whatarethey?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,ifnot,say“False”.1.Aninductorisadevicethatresistschangeinvoltage.2.AninductorusuallyhasnoresistancetoACcurrentbuthasahighresistancetoDCcu
7、rrent.3.Aninductoriselectricallyoppositetothecapacitor.4.Atcertainfrequency,ifacoiloffersalargeoppositiontothecurrent,ithaslargein-ductance.5.InductanceisrepresentedbytheletterMandmeasuredinunitofHenry.Ⅲ.TranslatethefollowingsentencesintoChinese.Aninductorisanel
8、ectricaldevice,whichopposesachangeinelectricalcurrent.2.ItusuallyhasnoresistancetoDCcurrentbuthasahighresistancetoACcurrent.3.Theinductorisacoilofwirethatmayhaveanair
