Question

state whether the resistance of filament of a bulb will degreesremain unchanged or increase when it glows

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Answer 1

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.

Answer 2

Answer:

When a bulb glows, the resistance of the filament increases.