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Though the same current flows through line wires or the filament of a bulb, yet only the latter glows.why?

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asked Jan 22, 2018 in Physics by Kundan kumar (49,132 points) ● 34 ● 379 ● 1010

Though the same current flows through line wires or the filament of a bulb, yet only the latter glows.why?

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answered Jan 22, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jan 23, 2018 by Kundan kumar
 
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The filament of the electric lamp has high resistance whereas the line wires are of negligible resistance. Since amount of heat generated is proportional to the resistance, the filament generates much more heat and it starts glowing.

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