How does an induction cooker heat food?
Induction cooker is a common cooker, which uses eddy currents generated by electromagnetic induction to heat food. Compared with the traditional electric furnace and gas stove, electromagnetic furnace has a lot of advantages, such as higher thermal efficiency, furnace surface clean, do not produce toxic material carbon monoxide, firepower stability and easy to control.
How exactly does the induction cooker work?
The phenomenon of electromagnetic induction, which is the induction of electric current in a conductor when the magnetic field changes, was first discovered by the English physicist Faraday.
Later, the scientist Maxwell deduced that the reason for electromagnetic induction is that the changing magnetic field creates an electric field in the surrounding space, which is perpendicular to the magnetic field and connects end to end, called the vortex electric field.
Induction cooker uses this kind of principle to make namely. Inside the induction cooker, the 50Hz common ALTERNATING current is changed into DC through certain methods, and then into the high-frequency current of about 20KHz. High-frequency current into the induction cooker panel in the coil, will produce a high-frequency magnetic field.
The high-frequency magnetic field generated by the coil creates a high-frequency electric field around it, which meets the conductor, the bottom of the pot, and creates a vortex current.
Induction cooker generally want to use iron pot or stainless steel pot, this is because iron pot has two benefits:
First, an iron pan is electrically conductive. If you use a ceramic pot, which is not conductive, you can't create eddy currents.
Second, iron POTS are ferromagnetic. The so-called ferromagnetism is that in the case of an external magnetic field, the material will be magnetized, forming a magnetic field in the same direction as the external magnetic field, so as to strengthen the external magnetic field.
When the magnetic field generated by the high-frequency current is strengthened, it can generate a stronger eddy electric field, and the current is large enough. If you use copper or aluminum, these two metals are not ferromagnetic and cannot strengthen the magnetic field, so the eddy field is not large enough.
Is induction cooker harmful to human body?
Because induction furnace produces high frequency oscillatory magnetic field, can have electromagnetic wave generation. However, the frequency of the induction cooker is only about 20,000 Hz, compared with the microwave oven 2 billion Hz, the frequency is 100,000 times lower. And, electromagnetic furnace radiation range is very small, only limited in a very small range near the electromagnetic furnace, intensity is not enough to produce harm to ordinary people.