After an incandescent lamp is turned on, the temperature of its filament rapidly increases from room temperature to its operating temperature. As the temperature of the filament increases, what happens to the resistance of the filament and the current through the filament?
(1) The resistance increases and the current decreases.
(2) The resistance increases and the current increases.
(3) The resistance decreases and the current decreases.
(4) The resistance decreases and the current increases

When the temperature of the filament increases, the vibrational energy of the constituent atoms increases which leads to increase in inter-atomic collision. Thus, the resistance would increase. The increases in resistance would obstruct the flow of charges more leading to decrease in the value of the current.

Hence, when the temperature of the filament increase, the resistance increases and current decreases.

Martebi Martebi · Answer 2 · 2022-01-21T14:43:02+01:00

There are a lot of fluctuations in temperature. As the temperature of the filament increases, the resistance increases and the current decreases.

The resistance increases for a set voltage

When there is an increase in resistance for a specific voltage, the current is said to be no longer increases in a proportionate term.

As the resistance increases, the current decreases, only when all other factors are said to be constant.

When the temperature of the filament increases, there seems to be a vibrational energy of the constituent atoms and thus they increases and this makes inter-atomic collision to also increase..

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