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id="tmyyfroktkho" class="ar_con_nr"> <div id="tmyyfroktkho" class="con_l fl"> <article class="ar_con bg louti"> <div id="tmyyfroktkho" class="ar_title"> <h1>淺談?lì)惐确ㄊ钩橄蟾拍钚蜗蠡?/h1> <div id="tmyyfroktkho" class="ar_title_b"> <div id="tmyyfroktkho" class="sub_title clear"> <span id="tmyyfroktkho" class="sp2 c6 fl">時(shí)間：<time class="fxtime">2015-07-30 16:53:45</time></span> <span id="tmyyfroktkho" class="sp1 c6 fl"><em id="zuozhe" class="noshow">寧?kù)o</em><em class="user_id noshow">642</em>由 <em class="nickname"></em> 分享</span> <span id="tmyyfroktkho" class="fl arc_btn"></span> </div> </div> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="tmyyfroktkho" class="con_article con_main" id="contentText"> <p>淺談?lì)惐确ㄊ钩橄蟾拍钚蜗蠡?/p><p> 　　初中物理教材中很多科學(xué)知識(shí)無(wú)法用實(shí)驗(yàn)演示，教師總是強(qiáng)加塞給學(xué)生，使學(xué)生很快喪失了學(xué)習(xí)的趣味性，因?yàn)閷W(xué)生頭腦中裝的物理素材很少。作為教師，應(yīng)通過(guò)類比法讓科學(xué)道理形象化，形象化的東西擺在學(xué)生面前，學(xué)生才會(huì)真真切切感覺到。初中學(xué)生需要的就是這種感覺，有了這種感覺，他們的求知欲才會(huì)應(yīng)運(yùn)而生，學(xué)習(xí)趣味會(huì)更加濃厚，課堂會(huì)更加活躍，教師教得輕松，學(xué)生學(xué)得快樂(lè)，從而提高教學(xué)效益，收到事半功倍的效果。</p><p><strong>　　現(xiàn)敘述一個(gè)案例：</strong></p><p><strong>　　一、導(dǎo)體中為什么會(huì)有大量的自由電子?而絕緣體中幾乎沒有自由電子?</strong></p><p> 　　教師講：電子繞原子核旋轉(zhuǎn)，不同物質(zhì)的原子核束縛電子的本領(lǐng)不一樣，絕緣體相比之下束縛電子本領(lǐng)更強(qiáng)，很少有電子可以掙脫原子核的束縛成為自由電子。</p><p> 　　教師類比: 各班的班長(zhǎng)對(duì)自己班的學(xué)生的束縛能力不一樣，自習(xí)課時(shí)，能力強(qiáng)的班長(zhǎng)管理的學(xué)生會(huì)認(rèn)真做作業(yè)，很少有學(xué)生不認(rèn)真做作業(yè)，類比為自由電子，能力弱的反之。</p><p><strong>　　二、電流怎樣形成?</strong></p><p> 　　教師講：如金屬導(dǎo)體，在沒有電壓作用下，它里面的自由電子是雜亂無(wú)章運(yùn)動(dòng)的，不能形成電流，一旦在電壓作用下，這些自由電子便由雜亂無(wú)章運(yùn)動(dòng)改為定向移動(dòng)，即形成電流。</p><p> 　　教師類比：把你們的教室看成一段導(dǎo)體，每個(gè)學(xué)生看成一個(gè)自由電子，沒有教師的管理，你們?cè)诮淌依镫S便走動(dòng)，這時(shí)能不能定向走動(dòng)?假如教師管理，讓你們排成一列縱隊(duì)，圍繞教室逆時(shí)針轉(zhuǎn)圈，這時(shí)能不能定向走動(dòng)?</p><p><strong>　　三、如何依據(jù)電流的流向分析正常電路和電源短路?</strong></p><p><strong>　　準(zhǔn)備知識(shí)：</strong></p><p> 　　(1)電阻表示導(dǎo)體對(duì)電流阻礙作用的強(qiáng)弱。</p><p> 　　(2)基本電路中的四大元件：電源、導(dǎo)線、開關(guān)、用電器(電阻)。</p><p> 　　(3)向?qū)W生說(shuō)明：這些元件本來(lái)都有電阻，而往往忽略電源、導(dǎo)線、開關(guān)的電阻，而不忽略用電器的電阻。</p><p> 　　(4)電源外部自由電子由負(fù)極移向正極(物理學(xué)中規(guī)定，電流由正極流向負(fù)極)。</p><p> 　　(5)打比方：電流欺軟怕硬。</p><p> 　　(6)微弱電流忽略不計(jì)。</p><p> 　　1. 教師講：電源短路是將導(dǎo)線直接接在電源的兩端，形成強(qiáng)大電流，迅速燒毀電源，甚至引發(fā)火災(zāi)，這是嚴(yán)重的電路故障。如圖1所示。</p><p> 　　教師類比：你們都在教室里，現(xiàn)要出去且只有前門可走，前門有一個(gè)人守門，這人很軟弱(類比為無(wú)電阻)，你們蜂擁而出，會(huì)不會(huì)形成強(qiáng)大的擁擠?會(huì)不會(huì)有危險(xiǎn)?</p><p> 　　2. 教師講：如果在圖1電路中接一個(gè)白熾燈泡，就不會(huì)形成強(qiáng)大的電流，也不會(huì)有危險(xiǎn)。如圖2所示。</p><p> 　　教師類比：如果守門人很兇，你們只會(huì)排隊(duì)而出，會(huì)不會(huì)形成強(qiáng)大的擁擠?感覺安全嗎?</p><p> 　　3. 教師講：如果將一根導(dǎo)線并在燈泡的兩端(試觸法)，看到燈泡不亮，用電流流向分析，電流流到十字路口作出的選擇是：不經(jīng)過(guò)燈泡，而是繞道而行。如圖3所示。</p><p> 　　教師類比：你們現(xiàn)在要出教室，前后門都開著，前門守門人很兇，而后門守門人很軟弱，你們便不會(huì)從前門走，而是從后門蜂擁而出，同樣會(huì)形成強(qiáng)大的擁擠。</p><p> 　　小結(jié)：如果這個(gè)類比法用得好，后面的如①串聯(lián)電路的局部短路和電源短路;②并聯(lián)電路只有電源短路;③電路故障分析等難點(diǎn)內(nèi)容都能夠很好的被學(xué)生掌握，且印象很深。</p><p><strong>　　分析這個(gè)案例，不難看出：</strong></p><p> 　　(1)原子核與核外電子是微觀領(lǐng)域的微粒，學(xué)生對(duì)它們毫無(wú)感性認(rèn)識(shí)，自然也不知道自由電子是怎么回事，實(shí)驗(yàn)演示更不可能，只能利用學(xué)生熟知的宏觀世界來(lái)類比，達(dá)到一種活靈活現(xiàn)的效果，使學(xué)生保持對(duì)電學(xué)的一種求知欲望。</p><p> 　　(2)再把學(xué)生比作每個(gè)自由電子，他們對(duì)自己的運(yùn)動(dòng)形式造成的整體運(yùn)動(dòng)效果是很清楚，類比到電流的形成，就有一種身臨其境的效果，在學(xué)習(xí)過(guò)程中體會(huì)到學(xué)習(xí)的樂(lè)趣。</p><p> 　　(3)教師一直強(qiáng)調(diào)短路，但學(xué)生對(duì)短路的認(rèn)識(shí)一直模糊不清。我們用試觸法做實(shí)驗(yàn)，看到實(shí)驗(yàn)現(xiàn)象，那畢竟是微觀微粒運(yùn)動(dòng)的宏觀外在表現(xiàn)。教師覺得自己講得很清楚了，可學(xué)生還是不清楚。通過(guò)這種類比法，學(xué)生不僅學(xué)得清楚，還覺得電學(xué)知識(shí)很簡(jiǎn)單。</p><p> 　　(4)依據(jù)電流流向分析電路，在電學(xué)中是至關(guān)重要的。上述案例中的類比法就說(shuō)得很透徹，學(xué)生在輕松的學(xué)習(xí)環(huán)境中找到解決問(wèn)題的法寶。</p><p> 　　總之，教學(xué)是一門藝術(shù)，我們教師要多想一些方法，讓學(xué)生避開沉重的作業(yè)負(fù)擔(dān)，激發(fā)學(xué)習(xí)興趣，提高教學(xué)質(zhì)量。</p> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="tmyyfroktkho" class="pnum"> <ul id="page_slice"> <div id="tmyyfroktkho" class="clear"></div> </ul> </div> </article> <div id="tmyyfroktkho" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="tmyyfroktkho" class="lb_3 chao"> <time>10-23</time> <a href="http://www.rzpgrj.com/diannao/anquan/fanghuoqiang/4042162.html" title="防火墻導(dǎo)致ftp無(wú)法使用的解決方法是什么" target="_blank">防火墻導(dǎo)致ftp無(wú)法使用的解決方法是什么</a> </li> <li id="tmyyfroktkho" class="lb_3 chao"> <time>10-19</time> <a href="http://www.rzpgrj.com/diannao/guzhang/meishengyin/4038538.html" title="全民K歌沒聲音無(wú)法使用攝像頭的解決方法是什么" 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