How an Induction Heater Works?

    An induction heater, as the name suggest works on the principle of induction. Here by the term Induction means to induce, induce an electric current. This induce electric current is also called eddy currents. In these type of heater, the principle of heating is same, the resistance heat produce due to resistance of the material to the flow of electric current. But in this system, we are not providing an external Voltage potential source, which, in conventional electric heating provide the required potential for the electrons to flow, Instead we are making the electrons to flow in to fro direction because of rapidly changing polarity. The change in Polarity is made by electromagnetic radiation that impinges to the surface of the material to be heated by a suitable formed emitter, usually formed  as a coil. Based on the frequency, the polarity changes form +ve to -ve and again form -ve  to again +ve a number of times in a given time. Because of this changing potential, a changing potential is created which is the source of flow of electric current limited by the coil shape. Thus, we see, only the part which is inside the coil get heated while the rest remains cool.      

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