why does the cord of an electric heater not glow while the heating element does
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The resistance of cord which is usually of copper or aluminium is very low so it does not glow. Whereas the heating element of the heater is made up of alloy which has a very high resistance. Therefore, when current flows through the heating element, it becomes too hot and glows red due to heating effect of electric current.
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The heater's heating element is made up of an alloy that has very high resistance, so when current flows through the heating element, it becomes too hot and glows red. But the cord's resistance, which is usually of copper or aluminium, is low, so it does not glow.
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