Two: induction cooker is the use of coil disk in the role of the control circuit to produce low-frequency (20 ~ 25KHZ) of the alternating magnetic field, through the magnetic conductivity (iron) pots and pans to produce a large number of dense eddy currents, both induced currents converted into heat to heat the food, the energy efficiency of the exceptionally high. The use of iron, special stainless steel or iron baked enamel pots and pans, and the diameter of the bottom of the pots and pans to 12 ~ 26 cm is appropriate. Induction cooktops are equipped with temperature controllers to prevent overheating, saving power and safety.