ICSE BoardEnglish MediumSTD 9PHYSICSCurrent Electricity1 Mark
Question
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
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Answer
The temperature of the filament increases when it glows. So, when the temperature of the wire (bulb filament) increases, ions in it vibrate violently. As a result, the number of collisions increases and hence the resistance increases.
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