TextContentselectriccircuit 電路current 電流power 電源load 負載wire 導線seriesway 串聯(lián)方式parallelway 并聯(lián)方式magneticfield 磁場electromagneticphenomena電磁現(xiàn)象flux 磁通magneticinductionintensity磁感應(yīng)強度fieldintensity 磁場強度

Notes:1.Generallyspeaking,wecancalltheelectriccircuitthecurrentpath,inwhichcertainelectricdevicesorequipmentareconnectedaccordingtosomeway.通常來說,我們稱電路為電流的路徑,在這條路徑里電氣裝置和設(shè)備按照某一種方式相連。2.Whentheapparatusisconnectedsothatthereisadividedpathoverwhichcurrentmayflow-twoormorealternativeroutesbetweentwopointsinacircuit,thearrangementiscalledaparallelcircuit.當電氣設(shè)備被連接起來使得在一個電路中在兩點之間,有一條被分開的路徑,通過這條路徑,電流流入

兩條或者

兩

條以上的路線,這樣的設(shè)置被稱為并聯(lián)電路。Text

Inourdailywork,weoftendealwiththeelectriccircuit.Soyouletyourselvesbefamiliarwiththeelectriccircuit.Generallyspeaking,wecancalltheelectriccircuitthecurrentpath,inwhichcertainelectricdevicesorequipmentareconnectedaccordingtosomeway.1Thesimplestelectriccircuit(Figure20-1)consistsof3parts,power,loadandwire.Figure20-1Simplestelectriccircuit1—Power;2—Wire;3—Load

Aftertheintroductionofelectriccircuit,let’sturntomagneticfieldandelectromagneticphenomena.Weallknowthatcurrentproducesmagneticfieldandchangesormotionofthemagneticfieldproducesinductionelectromotiveforce.Manyelectricequipmentonportmachineryworkonthatelectromagneticphenomena.Thebasicphysicalquantityofmagneticfieldisflux,magneticinductionintensityandfieldintensity.

Ⅰ.AnswerthefollowingquestionsinEnglish.1.Whatisanelectriccircuit?

2.Whatarethe3partsofasimplecircuit?

3.Whatistheseriesway?

4.Whatistheparallelway?

5.Whatisthebasicphysicalquantityofmagneticfield?

Ⅳ.Wr