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onmouseover="showsubmenu('高壓核相儀')">高壓核相儀</a> <div class="ihno5c4uhq" id="submenu_高壓核相儀" style="display:none"> <ul> </ul> </div> </li> </ul> </div> </div></div> <div id="ihno5c4uhq" class="inpage_right"> <div id="ihno5c4uhq" class="mbx2"><a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 淺談滑線滑動變阻器使用方法原理</div> <div id="ihno5c4uhq" class="inpage_content"> <div id="ihno5c4uhq" class="nr_main_box"> <h1 class="inside_rnewtil">淺談滑線滑動變阻器使用方法原理</h1> <div id="ihno5c4uhq" class="inside_rnewtime">點擊次數(shù)：3262 更新時間：2017-01-04</div> <div id="ihno5c4uhq" class="inside_rnewcon">滑動變阻器，相信大家對它都不陌生。我們在初中的物理課程中就能學(xué)到關(guān)于滑動變阻器的相關(guān)知識。簡單來說，滑動變阻器就是通過改變自身帶有的電阻來控制電路的一種使用在電路上的元件。此外，滑動變阻器的用法還多種多樣，因此它常常被巧妙地運用在生活的各種日常用品中。下面就讓小編為你介紹滑動變阻器的使用方法吧。滑動變阻器工作原理是電學(xué)中常用器件之一，它的工作原理是通過改變接入電路部分電阻線的長度來改變電阻的，從而逐漸滑動變阻器的電阻絲一般是改變電路中的電流大小，金屬桿一般是電阻小的金屬，所以當(dāng)電阻橫截面積一定時，電阻絲越長，電阻越大，電阻絲越短，電阻越小。主要作用：(1)保護(hù)電路。(2)通過改變接入電路部分的電阻來改變電路中的電流的大小和方向，從而改變與之串聯(lián)的導(dǎo)體(用電器)兩端的電壓。在連接滑動變阻器時，要求：“一上一下，重點在下"，金屬桿和電阻絲各用一個接線柱;實際連接應(yīng)根據(jù)要求選擇電阻絲的兩個接線柱。(3)改變電壓。探究歐姆定律時，起到改變與其串聯(lián)的用電器兩端電壓的作用。(4)利用伏安法測電阻，依據(jù)是歐姆定律的變形公式：使用方法：滑動變阻器在電路中可以作限流器用，也可以作分壓器用。在確保安全的條件下，如何選用限流式和分壓式這兩種不同的形式，是由電路中的需要來決定的。一、限流式①待測用電器電阻接近滑動變阻器電阻(也可選用分壓式接法)。②簡化電路，節(jié)約能源。二、分壓式以下情況必須使用分壓式接法：①待測用電器電阻遠(yuǎn)大于或遠(yuǎn)小于滑動變阻器電阻。②實驗要求待測用電器電流及其兩端電壓可以由0開始連續(xù)變化(例如測小燈泡的伏安特性曲線)。③實驗要求待測用電器電流及其兩端電壓可變范圍較大。④采用限流式接法時，無論如何調(diào)節(jié)變阻器，電流、電壓都大于對應(yīng)電表的量程。</div> <div id="ihno5c4uhq" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a 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