Question
Thu September 24, 2009 By: Aishwarya Unnikrishnan

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

Expert Reply
Fri September 25, 2009

Cord consists of inner conducting wire of low resistance and outer cladding of insulating material. Since the conducting wire has low resistance the electric energy is converted to heat to far less extent than in the heating element which is very high resistance material.

The heat energy manifests as the increased temperature of the heating element, and the tempreature is so that the heat radiation falls in visible range, hence we see glowing heating element.

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