Difference: The application scenarios and purposes of electromagnet principle and induction heating are different. Electromagnet principle is mainly used to manufacture electromagnetic cranes, electromagnetic valves and other equipment, and induction heating is mainly used to heat metal objects, such as bearings and metalworking. Connection: In the process of induction heating, the current generates a magnetic field in the induction coil, which in turn generates an induced electromotive force, which causes the molecules and atoms inside the metal object to vibrate and rub, thus generating heat. In this process, the electromagnet principle is also applied.