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Question

Why does the connecting cord of an electric heater not glow hot while the heating element does?
 


Solution

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

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