Why does the cord of an electric heater not g | vedclass

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(B) The heating element of an electric heater is a resistor. According to Joule's law of heating,the heat produced $(H)$ is given by $H = I^2Rt$,where

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The heating element has high resistance,while the cord has low resistance.

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(B) The heating element of an electric heater is a resistor. According to Joule's law of heating,the heat produced $(H)$ is given by $H = I^2Rt$,where $I$ is the current,$R$ is the resistance,and $t$ is the time. The resistance of the heating element is very high,which causes it to produce a large amount of heat,making it glow red. In contrast,the cord is made of good conductors like copper,which have very low resistance. Therefore,the heat produced in the cord is negligible,and it does not glow.

Material	Resistivity $(\Omega \,m)$
Silver	$1.6 \times 10^{-8}$
Copper	$1.62 \times 10^{-8}$
Aluminium	$2.63 \times 10^{-8}$
Tungsten	$5.20 \times 10^{-8}$
Nickel	$6.84 \times 10^{-8}$
Iron	$10.0 \times 10^{-8}$
Chromium	$12.9 \times 10^{-8}$

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

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