Role electric heating for industrial applications:
When current is passed through a conductor, the conductor becomes hot. When a magnetic material is brought in the vicinity of an alternating magnetic field, heat is produced in the magnetic material.
Similarly it was found that when an electrically insulating material was subjected to electrical stresses, it too underwent a temperature rise (Dielectric heating).
There are various method of heating a material but electric heating is considered to be far superior for the following reasons:
Due to complete elimination of dust and ash, the charges to maintain cleanliness are minimum and the material to be heated does not get contaminated.
With the help of manual or automatic devices, it is possible to control and regulate the temperature of a furnace with great ease.
Whereas in other forms of heating a temperature gradient is set up from the outer surface (iv) Low attention and maintenance cost:
Electric heating equipments normally do not require much attention and maintenance is also negligible.
Hence labour charges on these items are negligibly small as compared to alternative methods of heating.