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Question
Why is the heating element wound on a mica sheet and kept in between two mica sheets in an electric iron box?
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Solution
Mica is a good insulator of both electricity and heat and can withstand high temperature. It is also transparent. These properties were found suitable for use in electric iron,It electrically insulates the filament from the body of the iron which can become accidentally live if there is a breakdown of insulation. It transmits the heat from the filament to the plate of the iron,as the heat is transmitted by radiation and not by conduction. Radiation follows the laws of optics.Though it is a thermal insulator,it permits transmission of heat because of being transparent through radiation.
It electrically insulates the filament from the body of the iron which can become accidentally live if there is a breakdown of insulation.
It transmits the heat from the filament to the plate of the iron,as the heat is transmitted by radiation and not by conduction. Radiation follows the laws of optics.Though it is a thermal insulator,it permits transmission of heat because of being transparent through radiation.
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