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CBSE Class 10 Answered

Why does the cord of an electric heater does not glow while heating filament or element does?
Asked by snehaljain870 | 23 Sep, 2019, 09:30: PM
answered-by-expert Expert Answer
Resistivity of nichrome ~10-6 Ωm . Resistivity of Copper ~10-8 m .
Melting point of nichrome 1400 °C . Melting point of Copper 1085 °C .
 
Due to high resistivity,  nichrome wire gives high resistance compare to copper.
Also cross section area of heating coil made of nichrome is made smaller compare to that of power supply chord
in order to increase the resistance of heating coil.
Hence heating element of the heater has very high resistance so when current flows through the heating element,
it becomes too hot and glows red due to joule heating effect. 
Since melting point of hetaing element is greater than copper , heating element withstand high poer dissipaton and
becomes red hot. 
But the resistance of cord which is usually of copper or aluminium is very low so it does not become red hot and glow.
Answered by Thiyagarajan K | 23 Sep, 2019, 10:47: PM

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