Faraday's law of electromagnetic induction, when a block conductor is placed in an alternating magnetic field or moves in a fixed magnetic field, an induced current is generated in the conductor, and this current is closed in the conductor. The eddy current inside the conductor will also generate heat. If the resistivity of the conductor is small, the eddy current generated will be strong and the heat generated will be large.

Use enough electricity to generate a large eddy current in the conductor. The current in the conductor can generate heat, causing the metal to heat or even melt. So induction furnaces were built to smelt metals. In the induction furnace, there is a high-power power supply that generates high-frequency current and a coil that generates an alternating magnetic field. A crucible made of refractory material (such as ceramic) is placed in the middle of the coil to hold the metal to be melted. Extended information

The AC voltage is converted into DC power through a rectifier, and the DC power is turned into high-frequency AC power that exceeds the audio frequency through a high-frequency power conversion device. The high-frequency AC power is applied to the flat hollow spiral induction heating coil. , thus generating a high-frequency alternating magnetic field.

The magnetic field lines penetrate the ceramic plate of the stove and act on the metal pot. Strong eddy currents are generated in the cooking pot due to electromagnetic induction. When the eddy current overcomes the internal resistance of the pot and flows, it completes the conversion of electrical energy into thermal energy. The Joule heat generated is the heat source for cooking.