Question

why does the connecting cord of an electric heaters does not glow while the heating element does​

Answer 1

Here u go

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Answer 2

The heating elements of electric heaters are made of a special alloy(nichrome) which has very high resistivity due to which it glows hot red when current passes through it. However the connecting cord of the heaters is made of a conducting wire such as that of copper which has very low resistivity and does not glow on passing current.