Convert electrical energy into heat to heat objects. It is a form of electrical energy utilization. Compared with general fuel heating, electric heating can obtain a higher temperature (such as arc heating, the temperature can reach more than 3000 °C), easy to realize automatic control of temperature and long-distance control, vehicle electric heating cup can maintain a certain temperature distribution of the heated object as needed. Electric heating can directly generate heat inside the heated object, so the thermal efficiency is high, the heating speed is fast, and according to the heating process requirements, the overall uniform heating or local heating (including surface heating) can be realized, and vacuum heating and control atmosphere heating can be easily realized. In the process of electric heating, less exhaust gas, residues and soot are generated, which can keep the heated object clean and not pollute the environment. Therefore, electric heating is widely used in production, scientific research and testing. In particular, electric heating is used in the manufacture of single crystals and transistors, the quenching of mechanical parts and surfaces, the melting of ferroalloys and the manufacture of artificial graphite.
