How do induction cooktops work ?

• During induction cooking you heat a cooking vessel by electrical induction, rather than thermal heating by conduction via a flame, or an electric heating element.
• But, you must remember that your cooking vessel must have a magnetic base. The cooking vessel must be made of ferromagnetic metal or contain it. This could be cast iron or stainless steel. Here, heat comes from within the pan, thus making your cooking method, more efficient. 
• Copper or aluminium pans may not work unless they have magnetic layers down below. The best way to check is using a small magnet, to see if it sticks to the base.
• Let’s get into some more details. An induction hob has a copper coil, under a ceramic plate. When you put a pan on top of the heated surface, an alternating current is passed through it. This results in an oscillating magnetic field inducing a magnetic flux, which produces an eddy current in the ferrous pot. This acts as a secondary winding of a transformer. 
• This eddy current flowing through the resistance of the pot, thus heating it. With this gadget, heat transfer is 84%, compared to 74% with gas heating or ceramic electric. So you save in energy too. It is also safer than gas as there is no livid flame burning.
• A pan of water will boil in half of the time taken by a gas stove. It also increases the life of your pots and pans, as they have more contact with  the heat  current below, and also the current is running all through the pan, giving even heating, and there is no risk of hotspots in the pan, which causes scorching or burning of your food.
• OK! Now let us figure, what is an eddy current? It is the current that circulates in conductors, and which has also been induced in the conductor via a varying magnetic field. The magnetic field changes from negative to positive, thus creating a current. Eddy currents are capable of heating metallic objects without touching them. They are also well known for stopping trains and rollercoasters. They can also be found in electric brakescar speedometers and energy meters and so on.

Now let’s go a bit deeper into electric conduction and what that is.

Electric induction is also called magnetic induction. It can be called the `voltage` produced in a conductor due to its reaction with a magnetic field.

Electromagnetic induction is the magnetic movement around a coiled wire which induces an electric current through the wire. This is done by rotating magnets while a coiled wire moves between them. The magnets will rotate between the North and South poles. If these two poles come together, they would pull, as they are opposites and therefore attract. It is this pushing and pulling that causes these magnets to rotate around the wire coil, which produces an electric current.

McCoy Mart is one website you can buy this hob at, online. So here was brief on induction based cooktops and how they work.