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JFEM電機引接線電流的熱效應特種電纜

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產品型號JFEM

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更新時間：2023-07-12 09:11:19瀏覽次數：786次

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產品簡介

江蘇春晨電纜有限公司專業(yè)生產電機引接線，JFEM電機引接線電流的熱效應，實驗證明當電流過導體時，由于自由電子的碰撞，導體的溫度會升高。這是因為導體吸收的點電能轉換成為熱能的緣故。這種現象叫做電流的熱效應

詳細介紹

實驗證明當電流過導體時，由于自由電子的碰撞，導體的溫度會升高。這是因為導體吸收的點電能轉換成為熱能的緣故。這種現象叫做電流的熱效應。電流通過導體時所產生的熱量與電流強度的平方、導體本身的電阻、以及電流通過的時間成正比。這一結論稱為焦耳——楞次定律，其數學表達式為：Q=I²Rt，公式中：
Experiments show that when a current is over a conductor, the temperature of the conductor increases because of the collision of free electrons. This is because the electrical energy absorbed by the conductor is converted into thermal energy. This phenomenon is called the thermal effect of the current. The heat generated by a current through a conductor is proportional to the square of the current intensity, the resistance of the conductor itself, and the time passed by the current. This conclusion is called Joule - Lenz's law, the mathematical expression of Q=I - Rt in the formula:
Q：電流通過導體所產生的熱量，單位：焦耳（J）；
Q: the heat generated by a current through a conductor, unit: Joule (J);
I：通過導體的電流，單位：安（A）；
I: through the current of the conductor, unit: an (A);
R：導體的電阻，單位：歐（Ω）
R: the resistance of a conductor, unit: Europe (omega)
如果熱量以卡位單位，則Q=I?Rt公式可寫成：Q=0.24I²Rt=0.24Pt，此公式稱為焦耳-楞次定律。其中t的單位為妙，R的單位是歐，I的單位是安，熱量的單位是卡。JFEM電機引接線電流的熱效應
If the heat in card unit, Q=I? Rt equation can be written as: Q=0.24I - Rt=0.24Pt, this formula is called the Joule Lenz. The unit of T is wonderful, the unit of R is Europe, and the unit of I is Ann, and the unit of heat is card.
電流的熱效應在生產上有許多應用。電燈是利用電流產生的熱使得燈絲達到白熾狀態(tài)而發(fā)光，熔斷器是利用電流產生的熱使其熔斷而切斷電源。電流的熱效應也是近代工業(yè)中的一種重要加熱方式，如利用電爐煉鋼，電機通電烘干等。電流的熱效應也有它不利的一面，由于構成電氣設備的導線存在電阻，所有電氣設備在工作時要發(fā)熱，使溫度升高。如果電流過大，溫度升高多就會加速絕緣體老化，甚至損壞設備。為了保證電氣設備能正常工作，各種設備都規(guī)定了限額，如額定電流、額定電壓、和額定電功率等。JFEM電機引接線電流的熱效應
The thermal effect of current has many applications in production. The electric lamp is the heat produced by the current that makes the filament light up in the incandescent state, and the fuse uses the heat generated by the current to break it off and cut off the power. The thermal effect of current is also an important heating mode in modern industry, such as the use of electric furnace steelmaking, electric motor drying and so on. The thermal effect of electric current also has its disadvantage. Because there are resistances in electrical conductors that make up electrical equipment, all electrical equipments must be heated when they are working, so that the temperature will increase. If the current is too large, the increase of temperature will accelerate the aging of the insulator and even damage the equipment. In order to ensure the normal work of electrical equipment, all kinds of equipment are prescribed limits, such as rated current, rated voltage, and rated electric power.
電器設備的額定值通常用下標“e”表示，如Ie、Ue、Pe等，各種電器設備的銘牌上都有標注他們的數值。
The rated value of electrical equipment is usually expressed as "e", such as Ie, Ue, Pe and so on. All kinds of electrical equipment nameplates are marked with their values.