INDUCTION STOVE- AN ENGINEER'S TOUCH

Induction stove is a prime example of transferring of Electric energy to Heat energy.

INDUCTION STOVE

Before i begin to say the working of induction stove.We have to know about Faraday's law of electromagnetic induction and eddy currents.

PRINCIPLE:

MICHAEL FARADAY

Law 1: When there is a change in magnetic field an emf is induced in the coil.

EDDY CURRENT

Law 2: When the alternating current flows through the coil an alternating magnetic field is produced.

Eddy current:

When the stationary magnetic field is moved around the moving conductor (or) when the stationary conductor is placed in an alternating magnetic field , the current is induced in the form of circulating loops known as eddy currents.

WORKING:

When an alternating current flows through the coil which has been placed inside the induction stove, an oscillating magnetic field is created and this alternating magnetic field will induce eddy currents in the vessel that is placed above the stove which contains the food that has to be cooked. This eddy current flows through the electrical resistance of the vessel and produces heat. This heat is used to cook the food . That is why vessels containing ferromagnetic metal is placed in the induction stove. Aluminium and copper vessels does not work on an induction stove because of the magnetic and electrical  properties. Aluminum and copper cookware are more conductive than steel, and the skin depth in these materials is larger since they are non-magnetic. The current flows in a thicker layer in the metal, encounters less resistance and so produces less heat. The induction cooker will not work efficiently with such pots. 

For its merits and demerits and its impact on environment refer http://en.wikipedia.org/wiki/Induction_cooking