《港口机械与电气专业》-Lesson 20 The Basis of the Electric1

TextContentselectriccircuit 电路current 电流power 电源load 负载wire 导线seriesway 串联方式parallelway 并联方式magneticfield 磁场electromagneticphenomena电磁现象flux 磁通magneticinductionintensity磁感应强度fieldintensity 磁场强度

Notes:1.Generallyspeaking,wecancalltheelectriccircuitthecurrentpath,inwhichcertainelectricdevicesorequipmentareconnectedaccordingtosomeway.通常来说,我们称电路为电流的路径,在这条路径里电气装置和设备按照某一种方式相连。2.Whentheapparatusisconnectedsothatthereisadividedpathoverwhichcurrentmayflow-twoormorealternativeroutesbetweentwopointsinacircuit,thearrangementiscalledaparallelcircuit.当电气设备被连接起来使得在一个电路中在两点之间,有一条被分开的路径,通过这条路径,电流流入

两条或者

两

条以上的路线,这样的设置被称为并联电路。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