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style="display:none"> <ul> </ul> </div> </li> <li id="quimsyk" class="yj"><a href="/ParentList-1935169.html" class="yja" onmouseover="showsubmenu('高壓核相儀')">高壓核相儀</a> <div class="quimsyk" id="submenu_高壓核相儀" style="display:none"> <ul> </ul> </div> </li> </ul> </div> </div></div> <div id="quimsyk" class="inpage_right"> <div id="quimsyk" class="mbx2"><a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > 雙管滑動(dòng)變阻器作用你了解嗎</div> <div id="quimsyk" class="inpage_content"> <div id="quimsyk" class="nr_main_box"> <h1 class="inside_rnewtil">雙管滑動(dòng)變阻器作用你了解嗎</h1> <div id="quimsyk" class="inside_rnewtime">點(diǎn)擊次數(shù)：634 更新時(shí)間：2024-01-01</div> <div id="quimsyk" class="inside_rnewcon"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;"><strong><span style="color: rgb(0, 0, 0);">雙管滑動(dòng)變阻器作用你了解嗎</span></strong></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;"><strong><span style="color: rgb(0, 0, 0);">雙管滑動(dòng)變阻器</span></strong></span></span><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;"><strong><span style="color: rgb(0, 0, 0);"></span></strong><span style="color: rgb(0, 0, 0);">在初中物理占有極為重要的一席之地，被稱(chēng)為中考的八大基本器材之一，是八大器材中的非測(cè)量工具。雙管滑線滑動(dòng)變阻器在電路中到底起什么作用，學(xué)生往往不太容易把握。下面就雙管滑線滑動(dòng)變阻器在電路中的作用結(jié)合實(shí)例進(jìn)行討論。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　1、達(dá)到控制變量的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　欲探究電流與電阻及電壓的關(guān)系，要采用控制變量法進(jìn)行實(shí)驗(yàn)。在探究電流與電阻的關(guān)系時(shí)，應(yīng)該控制電壓不變。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　2、達(dá)到保護(hù)電路的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　根據(jù)歐姆定律I=U/R知道，當(dāng)電源電壓一定時(shí)，電路的總電阻越小，電流就越大，電路中的某些元件如電流表就越有損壞的可能。因此，在伏安法測(cè)電阻、用電流表電壓表測(cè)小燈泡的電功率等多個(gè)電學(xué)實(shí)驗(yàn)中，都配有雙管滑線滑動(dòng)變阻器。教材反復(fù)強(qiáng)調(diào)，電路連接完畢閉合開(kāi)關(guān)前，一定要將雙管滑線滑動(dòng)變阻器在電路中的阻值調(diào)至。目的是為了盡可能增大電路的總電阻，使電路中的電流達(dá)到小，從而達(dá)到保護(hù)電路的目的。如伏安法測(cè)電阻、用電流表和電壓表測(cè)小燈泡的電功率等實(shí)驗(yàn)都利用了雙管滑線滑動(dòng)變阻器保護(hù)電路的作用。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　3、達(dá)到改變電壓的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　4、達(dá)到改變小燈泡的亮度的目的?實(shí)驗(yàn)要求用伏安法測(cè)出燈泡亮度由不亮到燈絲暗紅、微弱發(fā)光及至正常發(fā)光時(shí)的電流與電壓。這里整個(gè)過(guò)程的多次測(cè)量都依賴(lài)于調(diào)節(jié)電路中的雙管滑線滑動(dòng)變阻器。通過(guò)改變雙管滑線滑動(dòng)變阻器在電路中的電阻，使小燈泡的電流和電壓相應(yīng)發(fā)生改變，從而實(shí)際功率逐步增加，亮度逐漸變亮。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　5、達(dá)到實(shí)現(xiàn)調(diào)整電壓到值的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　根據(jù)功率的公式P=UI知道，小燈泡的額定功率應(yīng)該等于小燈泡的額定電壓與額定電流的乘積。因此，用實(shí)驗(yàn)測(cè)小燈泡的額定功率時(shí)，必須要將小燈泡兩端的實(shí)際電壓調(diào)整到與額定電壓的大小相等。這里仍然是利用滑雙管滑線滑動(dòng)變阻器通過(guò)改變其在電路中的阻值來(lái)達(dá)到調(diào)整電壓到值的目的。此處容易與控制變量這一目的相混淆。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　6、達(dá)到改變電流大小的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　當(dāng)探究電磁鐵磁性強(qiáng)弱與電流大小的關(guān)系時(shí)，應(yīng)當(dāng)控制電磁鐵線圈的匝數(shù)不變，而改變線圈中電流的大小。在實(shí)驗(yàn)時(shí)，將線圈與滑動(dòng)變阻串聯(lián)，就可以達(dá)到通過(guò)改變變阻器在電路中的阻值而改變線圈中電流的目的。當(dāng)然，由于線圈的電阻比較小，該變阻器仍然要承擔(dān)保護(hù)電路的責(zé)任。</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　7、達(dá)到實(shí)現(xiàn)多次測(cè)量的目的</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(102, 102, 102); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0);"><span style="font-family: 楷體_gb2312;"><span style="font-size: 16px;">　　在用伏安法測(cè)量電阻實(shí)驗(yàn)中，用雙管滑線滑動(dòng)變阻器來(lái)實(shí)現(xiàn)多次測(cè)量，以達(dá)到多次測(cè)量求平均值而減小誤差的目的。</span></span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img46.chem17.com/9/20240101/638396932855531697913.jpg" title="[{9X1AXAEGG2C8OWS@OH%AQ.jpg" alt="[{9X1AXAEGG2C8OWS@OH%AQ.jpg"/></p><p><br/></p></div> <div id="quimsyk" class="inside_newsthree"> <p 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