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id="tqrzhqzaxmzj" class="lhtab"><span id="tqrzhqzaxmzj" class="on span1">產(chǎn)品詳情</span><span id="tqrzhqzaxmzj" class="span2">在線留言</span></div> <div id="tqrzhqzaxmzj" class="page-procon"> <p>小功率電阻器通常為封裝在塑料外殼中的碳膜構(gòu)成，而大功率的電阻器通常為繞線電阻器，通過將大電阻率的金屬絲繞在瓷心上而制成。<br />如果一個(gè)電阻器的電阻值接近零歐姆(例如，兩個(gè)點(diǎn)之間的大截面導(dǎo)線)，則該電阻器對電流沒有阻礙作用，并聯(lián)這種電阻器的回路被短路，電流無限大。如果一個(gè)電阻器具有無限大的或很大的電阻，則串接該電阻器的回路可看作開路，電流為零。工業(yè)中常用的電阻器介于兩種情況之間，它具有一定的電阻，可通過一定的電流，但電流不像短路時(shí)那樣大。電阻器的限流作用類似于接在兩根大直徑管子之間的小直徑管子限制水流量的作用。電阻，英文名resistance，通常縮寫為R，它是導(dǎo)體的一種基本性質(zhì)，與導(dǎo)體的尺寸、材料、溫度有關(guān)。歐姆定律說，I=U/R，那么R=U/I，電阻的基本單位是歐姆，用希臘字母"Ω"表示，有這樣的定義:導(dǎo)體上加上一伏特電壓時(shí)，產(chǎn)生一安培電流所對應(yīng)的阻值。電阻的主要職能就是阻礙電流流過。事實(shí)上，"電阻"說的是一種性質(zhì)，而通常在電子產(chǎn)品中所指的電阻，是指電阻器這樣一種元件。歐姆常簡稱為歐。表示電阻阻值的常用單位還有千歐(kΩ)，兆歐(MΩ)，毫歐(m Ω)。</p><p> </p><p><strong>產(chǎn)品說明</strong><br />功率：額定發(fā)熱功率為4.6KW<br /><strong>ZX1型電阻器</strong>用途說明：<br />ZX1系列鑄鐵電阻器用于交流50HZ電壓至660V，或直流電壓440V的電路中，主要做電動(dòng)機(jī)的起動(dòng)、調(diào)速和制動(dòng)之用。電阻器為開啟式。<br /><br /><img alt="產(chǎn)品說明" src="http://www.shwenda.com/uploadfile/image/20170901/20170901155624_51548.jpg" style="margin:0px" /></p><p><span style="font-size:14px"><strong>ZX1型電阻器</strong>適用于交流50Hz，電壓至660V及直流電壓440V的電路中，主要用做電動(dòng)機(jī)的起動(dòng)制動(dòng)與調(diào)速電阻之用，其容量約為4.6KW。</span><br /><span style="font-size:14px">1、海拔高度不超過2500米；</span><br /><span style="font-size:14px">2、周圍介質(zhì)溫度不超過+40℃及不低于-30℃；</span><br /><span style="font-size:14px">3、當(dāng)+20℃±5℃時(shí)空氣相對溫度不大于85%；</span><br /><span style="font-size:14px">4、周圍介質(zhì)中無足以腐蝕金屬和破壞絕緣及有爆炸危險(xiǎn)的氣體及導(dǎo)電塵埃；</span><br /><span style="font-size:14px">5、必須有防雨要設(shè)備并是不會滿水蒸汽的地區(qū)；</span><br /><span style="font-size:14px">6、在無劇烈震動(dòng)或顛簸的地區(qū)。</span><br /> </p><p><br /><span style="font-size:14px"><strong> </strong></span></p><table border="0" cellpadding="0" cellspacing="0" style="line-height:1.6em"><tbody><tr><td> </td></tr></tbody></table> <div id="tqrzhqzaxmzj" class="pagetb"> <p> 上一條：<a 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