THE SAME AMOUNT OF CURRENT FLOWS THROUGH THE CONNECTING WIRES AND THE BULB FILAMENT.HOWEVER,IT IS ONLY THE FILAMENT THAT GLOWS.WHY?
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132
Very Good Question. Thanks for asking it !!!
When electric current passes very thin high resistance filament which has very high melting point of 3800 degree Celsius
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Due to its very high resistance and melting point the tungsten filament can be kept white hot without melting away whereas when same electric current passes through connecting wires it produces negligible heat because of its low resistance.
Electric bulb is filled with chemically unreactive gas like argon or nitrogen which do not react with hot filament and hence prolongs the life of filament .
When electric current passes very thin high resistance filament which has very high melting point of 3800 degree Celsius
.
Due to its very high resistance and melting point the tungsten filament can be kept white hot without melting away whereas when same electric current passes through connecting wires it produces negligible heat because of its low resistance.
Electric bulb is filled with chemically unreactive gas like argon or nitrogen which do not react with hot filament and hence prolongs the life of filament .
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38
This shows that the filament glows
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