Initial stage
In 1840, British physicist Joule proposed Joule's law, laying the foundation for the working principle of electrical heating elements; in 1859, the world's first heating element was born; in 1905, Albert Marsh discovered nickel-chromium alloy, whose strength was 300 times that of other heating elements at that time, and it could be used to manufacture durable high-resistance wires, completely transforming the electric heating element industry.
Growing stage
During this period, the materials used in the electric heating elements were improved, such as using high-quality A-grade nickel-chromium wire and using magnesium oxide or magnesium oxide powder as insulators; in 1910, the United States first successfully developed an electric iron using nickel-chromium alloy heating wires and it quickly became popular; in 1917, the United States invented the world's first metal-shell electric heating tube; in 1925, Japan produced cookware with electric heater, becoming the prototype of modern rice cookers.
Popularization stage
Under the stimulation of factors such as continuous progress in global science and technology, significant reduction in electricity costs, continuous development of the global economy, and continuous growth in per capita GDP, electric heating appliances began to enter the daily lives of the general public. Air conditioners, washing machines, dryers, water heaters, microwave ovens, rice cookers and other household appliances have been increasingly popular worldwide, promoting the entry of the electric heating element industry into the popularization period.
Maturity stage
The industry has entered the mature stage, and heating elements have become indispensable important devices in people's daily lives and industrial production. With the evolution of consumer demands and the upgrading of industrial technology, household appliances continue to develop in the direction of multi-functionality, miniaturization, portability and intelligence, and their internal structures have become increasingly complex and precise. At the same time, mature technologies have led to the introduction of electric heater in innovative application fields, such as new energy vehicles and medical machinery, raising the requirements for the performance and structural design of the heating items.
