Electric heating is the process of converting electric energy into heat energy. Since the discovery that power supply can produce thermal effect through wires, many inventors in the world have been engaged in the research and manufacture of various electrothermal appliances. The development and popularization of electric heating, like other industries, follows such a law: from advanced countries to all countries in the world; from cities to rural areas; from collective use to families and then to individuals; products from low-grade to high-end.
Most of the electric appliances in the embryonic stage of the 19th century were clumsy. The earliest electric appliances were used for life. In 1893, the prototype of the electric cooker appeared and was used in the United States. Then in 1909, the use of electric stove was put in the stove, that is to say, the heating was transferred from firewood to electricity, that is, from electric energy to heat energy. However, the rapid development of the real electric appliance industry is after the invention of nichrome, which is used as an electric heating element.
In 1910, the United States first successfully developed the electric bucket made of nickel chromium alloy heating wire, which fundamentally improved the structure of the electric bucket, and its use was rapidly popularized. In 1925, the electric heating element was installed in the pot in Japan, which became the prototype of modern electric rice cooker. At this stage, electric heating products such as electric furnace for laboratory, melting furnace and heater also appeared in industry. The period from 1910 to 1925 was a great development stage in the history of electric heating appliances. In the aspects of family and industry, the emergence and popularization of various kinds of electric heating appliances have been developed rapidly, especially in the family.
The invention of Ni Cr alloy lays the foundation for the development of electric heating appliance industry. Energy saving and emission reduction has become a basic national policy. Due to the advantages of energy saving, the trend of electric heating gradually replacing the traditional combustion heating has become more and more obvious. Under the policy background of vigorously encouraging energy conservation and emission reduction, its development will face a very favorable policy environment, with great development potential.