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電阻的使用你需要考慮哪些性能參數(shù)？

文章來源：admin
發(fā)布時(shí)間：2018-07-18
簡(jiǎn)介：Resistance (電阻)，在日常生活中應(yīng)用的非常廣泛，電阻也被我們經(jīng)常稱其為R，單位為歐姆。電阻只是一個(gè)統(tǒng)稱，對(duì)其深入了解之后會(huì)知道電阻多種多樣，可以分為：固定電阻、可變電阻...

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Resistance(電阻)，在日常生活中應(yīng)用的非常廣泛，電阻也被我們經(jīng)常稱其為R，單位為歐姆。電阻只是一個(gè)統(tǒng)稱，對(duì)其深入了解之后會(huì)知道電阻多種多樣，可以分為：固定電阻、可變電阻、特殊電阻、 RT型碳膜電阻、RJ型金屬膜電阻、RX型繞線電阻、片狀電阻、大功率電阻、小功率電阻。

電阻是一個(gè)導(dǎo)體的固有屬性，即便導(dǎo)體上沒有電流流過，其電阻也是存在的。那么使用一個(gè)電阻，我們需要從那幾個(gè)性能參數(shù)去考慮呢？

電阻的容差：通用場(chǎng)合選用1％精讀，當(dāng)有特殊要求比如輸出電壓精度要求時(shí)選用更小的；

選擇比率：當(dāng)阻值不是很重要時(shí)，比如分壓器，以減少電路中不同阻值種類數(shù)目以實(shí)現(xiàn)大批量采購節(jié)約成本；

電阻最大電壓：電阻其實(shí)也可以被擊穿，高壓應(yīng)用時(shí)要注意；

電阻溫度系數(shù)：大多數(shù)電阻都有很小的溫度系數(shù)（50～250ppm每度），電阻發(fā)熱時(shí)，線繞電阻的溫度系數(shù)會(huì)有較大變化；

電阻額定功率：一般電阻功耗為額定值一半；

電阻脈沖功率：在較短時(shí)間內(nèi) 線繞電阻可以承受遠(yuǎn)大于其額定功率的沖擊，但非線繞電阻不行；

使用電阻叢上面幾點(diǎn)參數(shù)就可以選擇出你需要的電阻，電阻根據(jù)不同的應(yīng)用范圍又有所不同，在使用電阻也可以根據(jù)所開發(fā)的產(chǎn)品領(lǐng)域去尋找自己想要的電阻，如風(fēng)能太陽能的產(chǎn)品就需要考慮精密電阻；

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