Electric heating is the process of converting electrical energy into thermal energy. Since the discovery that power sources can undergo thermal effects through wires, many inventors around the world have been engaged in the research and manufacturing of various electric heating appliances. In the fields of home and industry, the emergence and widespread application of various types of electric heating appliances have experienced rapid development, especially in the household sector. So the invention of nickel chromium alloy laid the foundation for the development of the electric heating appliance industry.