《電子信息專(zhuān)業(yè)英語(yǔ)》課件 Lesson 2 Application of Ohms Law

Lesson2ApplicationofOhm’sLawKeywords■circuit

[‘s?k?t]

電路、線路■

arrows['?ro]箭頭■series['siriz]串聯(lián)■generator['d??n?,ret?]發(fā)電機(jī)、發(fā)生器■parallel[‘p?r?,l?l]并聯(lián)■

conductors[k?n'd?kt?]導(dǎo)體■series-parallel['siriz]['p?r?,l?l]

串并聯(lián)的

■apparatus[,?p?'ret?s]儀器■path[p?θ]通道■voltagedrop['volt?d?][drɑp]電壓降■current[‘k??nt]電流■potentialdifference[p?'t?n??l]['d?f?r?ns]電位差■divides

[d?'va?d]分流、分開(kāi)■circuitelement['s?k?t]['?l?m?nt]電路元件■

points[p??nt]

點(diǎn)，節(jié)點(diǎn)

■

terminal['t?m?n!]

終點(diǎn)、末端■resistances

[r?'z?st?ns]

電阻

■termed

稱(chēng)為（=call）■

arrangements[?'rend?m?nt]裝置、設(shè)備

■no-load

空載（無(wú)負(fù)載）■

splits[spl?t]分流、分開(kāi)

■

apparent[?'p?r?nt]顯然的、明顯的■branches分支，支路（電路）

■internal[?n't?n!]內(nèi)部的■工作任務(wù)：如何調(diào)節(jié)燈的亮度？■學(xué)習(xí)目標(biāo)：掌握最簡(jiǎn)單的電路的基本原理，理解歐姆定律中元件串聯(lián)，并聯(lián)的含義，掌握電路中各個(gè)電學(xué)參量之間的關(guān)系■

重點(diǎn)難點(diǎn)：串聯(lián)、并聯(lián)電路的電學(xué)參量之間的關(guān)系■

推薦學(xué)時(shí)：6學(xué)時(shí)Howtomonitorthebrightnessofalightinacircuit?

Whichsegmentdecidesthebrightnessofthelightinthecircuit?Wecanseethebrightnessadjustablelightanywhereinthemarketorinourhome.Rotatetheknob,thelightwillturnbrilliantorturndark.So,whenyourotatetheknob,whathaschangedinthecircuit?

■Aseriescircuitisoneinwhichthecurrentflowsinasinglecontinouspathandisofthesamevalueateverypointincircuit

(figure1).

ResistancebatteryR1ER2Figure1-aFigure1-b

■Inaparallelcircuittherearetwoormorecurrentpathsbwtweentwopointsinthecircuit,asshowninfigure2.R1

R2

AB

－

＋

Figure2■Figure3.showsaseries-parallelcircuit.

ABR1R2R2－

＋

－

＋

R1R2R3R4ABFigure3-aFigure3-b

■Avolagesourcehavingalowinternalresistanceismoredesirable.R1R2R3R4ABC－

＋

Figure