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

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The cord of the electric heater is made up of copper.

The cord of the heating element is made up of alloy.

The alloy has higher resistance than copper.

All of the above

answer is D.

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Detailed Solution

The cord of the electric heater does not glow while heating because the cord of the electric heater is made up of copper; the cord of the heating element is made up of alloy, and the alloy has higher resistance than copper.
The cord of the electric heater is made up of thick copper wire, and the cord of the heating element is made up of an alloy. Copper has low resistance compared to alloy. Hence the heat produced in the heating element is much higher than in the cord when current is passed through it. Thus the heating element becomes hot and glows.

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