The generally applicable formula for electric heating is: Q=I^2R t. Experiments have shown that when the resistor resistance and current are equal, the longer the current is energized, the more heat the current generates.

Generally, the technology of domestic metal electric heating wire electric heating elements has reached international standards, and has created a lot of foreign exchange income for our country. However, the PTC type has temperature limitations, and the electric heating film type electric heating elements have pollution due to its production. The problem has been unable to be solved, there are many restrictions on production, and rapid development cannot be achieved.

Classification of electric heating elements:

Heating PTC thermistor has constant temperature heating characteristics. The principle is that the PTC thermistor self-heats after being powered on, causing the resistance value to enter the transition zone, and the temperature is constant. Heating the PTC thermistor surface temperature will maintain a constant value. Heating element designed using the constant temperature heating characteristics of PTC thermistor.

In small and medium-power heating situations, PTC heating elements have the advantages of constant temperature heating, long natural life, high heat conversion rate, and minimal influence on the power supply voltage. Their application in electric heating appliances is increasingly favored by R&D engineers. The traditional heating elements are not up to the task.