Gwargwadon Yawanci da Tsohon Lafiya
Akwai wasu abincin da ake fadada, kamar silver, copper, aluminum, wanda ne da yawan electrons mai sarrafa. Saboda haka, wannan nau'o'i na abincin zai iya taimaka da tsarin current, ya'ni muna son in ba shi karfi. Amma resistivity na wannan nau'o'i ana iya amfani da temperature. Duk da cewa abincin suna bari da electrical resistance idan an yi amfani da temperature. Amma babban da ake amfani da abincin da ba su metal, har zuwa da tsarin temperature.
Idan muka ambaci kafin da ake fadada da abincin metal mai zurfi, kuma muka yi amfani da ice don koyar da tsarin temperature 0oC, kuma muka zama tsarin temperature daga 0oC zuwa 100oC ta harkar ita.
A lokacin da muka yi amfani da tsarin temperature, idan muka koyar da tsarin resistance a zaman lafiya, za a gane cewa electrical resistance na kafin da ake fadada ya zama zama da tsarin temperature. Idan muka yi graph da take resistance variation with temperature ya'ni resistance vs temperature, za a gine straight line kamar da take bayyana a cikin figure. Idan muka kawo wannan straight line a nan resistance axis, za a gine cut da temperature axis a wurin temperature, – t0oC. Daga graph, za a gane cewa, a wannan temperature, electrical resistance na abincin metal ya zama zero. Wannan temperature ya zama inferred zero resistance temperature.
Amma zero resistance na abinci ba zan iya faru a halin gwamnati. Faktan, rate of resistance variation with temperature ba zan iya ci gaba da tsarin temperature. Graph na daidai an bayyana a cikin figure.
Idan R1 da R2 measured resistances a temperature t1oC da t2oC. Don haka muka zai iya rubuta equation masu:
Daga equation, muka zai iya hasashen resistance na abinci a duk tsarin temperature. Idan muka koyar da resistance na abincin metal a t1oC, kuma wannan shine R1.
Idan muka sanu inferred zero resistance temperature, ya'ni t0 na abinci, muka zai iya hasashen unknown resistance R2 a temperature t2oC daga equation.
Resistance variation with temperature ana amfani a kan hasashen temperature variation na abinci. Misali, a temperature rise test of transformer, don hasashen winding temperature rise, equation ya amfani. Ba zan iya samun winding a nan insulation system na electrical power transformer don hasashen temperature, amma muka da graph na resistance variation with temperature. Bayan muka hasashen electrical resistance na winding a karamin da karshe test run na transformer, muka zai iya hasashen temperature rise a winding na transformer a lokacin da test run.
20oC an yanayi a standard reference temperature don mention resistance. Yana nufin cewa idan muka ce resistance na abinci shine 20Ω, yana nufin cewa resistance ya amfani a temperature 20oC.
Source: Electrical4u
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