Induction cooktops are getting very common nowadays. But have you ever thought how exactly it is getting heated? Of course, you switch it on and then put the foods on top of it in a container and then, it gets heated. But what is the process by which it is heated only through current? Or why is it is called induction cooking?
The answer lies in, by the process by which heat is generated in the first place. Here the heat is generated through a phenomenon called induction heating. What is induction heating?
To simplify it, let’s get into the definition first. Induction heating is a process by which an object is heated (the object must be electrical conductive which means a good conductor of electricity) by electromagnetic induction through heat generated in the object itself. This heat is generated by the eddy current.
There are a few things to consider here. First, the object must be the good conductor of electricity. Which means electricity should be passed through the object without much obstruction. Metal is a good example if electric conductor.
The second aspect is electromagnetic induction. It is the production of an electromotive force or simply voltage (as we know) across an electrical conductor (for example metals) due to its dynamic interaction with a magnetic field (simply, magnetic effect of electric current or magnets).
The third important key factor is eddy current. Eddy current is actually nothing but electric currents induced in the conductors due to the conductor moving through a uniform magnetic field. Or the conductor could be stationary and the magnetic field could be changing. Due to this dynamic interaction, currents are induced in the conductor and these currents are called eddy current.
With these three key factors in place, heat is generated in the object (metal) through which heat is spread. This type of heating is called induction heating.