The hot resistance of the bulb's filament is higher than its cold resistance because...

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?
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2 Answers

Answer :

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is positive.

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Answer :

This  is  because  resistance  of  a  conductor  increases  with  increase  in  temperature .
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