Question

why does the cord of an electric heater not glow while the heating element does?​

Answer 1

The heating element of the heater blocks the electric current and does not let it pass. So the heating element gets heated and glows due the heat. It has high resistivity , so it does not melt. The cord of the electric heater is a good conductor of electricity so it does not get heated up and also does not glow.

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Answer 2

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cord is electric heater has a more resistance that's the reason it does not glow