Question

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

Answer 1

Answer:

the heating element of the heater is made up of alloy which have very high resistance. so when current flows through the heating element, it becomes too hot glows red due to 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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Answer 2

Answer:

The resistivity of an alloy is higher than the pure metal. Moreover, at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal.