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一、电热的概念电流通过导体时电能转化为内能的现象叫作电流的热效应,这时导体会发热,产生的热量称为电热.电流的热效应是导体通电时都会发生的现象,热效应现象的产生与导体电阻的存在有关.当电阻消失时,热效应现象也就不存在了.电流通过导体,导体就要发热,电热器(电炉、电烤箱、电烙铁等)就是利用这种现象制成的.电热器工作过程中,消耗的电能转化成电热.电热器的主要工作部件是发热体,它是用电阻大、熔点高的金属电阻线绕在绝缘材料上制作的.
First, the concept of electric current through the conductor when the electrical energy into internal energy is called the current thermal effect, then the conductor will be heated, the heat generated is called electric heat. Current thermal effect is the conductor when the power will occur when the phenomenon of thermal effects Produced with the existence of the existence of the resistance of the conductor .When the resistance disappears, the thermal effect phenomenon does not exist .Current through the conductor, the conductor will heat, electric heater (electric oven, electric oven, electric iron, etc.) is the use of this phenomenon made of During the working of the electric heater, the consumed electric energy is transformed into electric heating.The main working part of the electric heater is the heating element, which is made by winding a metal resistance wire with large resistance and high melting point on the insulating material.