The relationship between filament resistance and temperature and why Thank you!

The relationship between filament resistance and temperature and why Thank you!

The resistance of the filament is related to the temperature. When the filament is cold, the resistance is small. When the lamp is on, the resistance becomes large due to the high temperature of the filament. If the switch is operated, the current through the bulb is several times of the normal working time due to the small resistance at the moment when the lamp is turned on, which may cause damage to the filament. This often reduces the life of the filament

It is said in the book that the filament resistance varies with the temperature, so we can't find the average value as the resistance of the small bulb, but some of them say yes. What's that really like

When the small bulb becomes incandescent, the resistance will not change, or the change is very small, so the resistance will be fixed. When the current flowing through the small bulb is very small, because the generated temperature is dissipated and the temperature does not change, the internal resistance of the bulb is also fixed

If the resistance of a small bulb is measured by changing the two ends of the bulb and passing through the bulb, it is convenient to study the effect of filament resistance on its temperature
This is a physics problem

If measuring the resistance of small bulb is to change the (voltage) and (current) at both ends of small bulb, it is convenient to study the effect of filament resistance on its temperature