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Anonymous users2024-02-06It is this extra heat that causes the filament to be blown off.
The filament is burned out as a result of the thermal effect of the current, indicating that the excessive current is the real cause, combined with Ohm's law, and then find out why the current is too large at this time, you can judge the real "culprit".
The filament has a peculiarity, that is, when the temperature increases, the resistance becomes larger, and when the temperature is lower, the resistance is less Therefore, when the filament is energized in a "cold" state, the resistance is smaller at this timeAccording to Ohm's law, when the voltage is constant, a large current will be generated, which will cause the filament to heat up rapidly, causing it to burn out
The resistance of the incandescent lamp filament also increases with the increase of temperature, when it emits light normally, the temperature is higher and the resistance is larger, and when the lamp is just turned on, the temperature is lower (room temperature) and the resistance is smaller. According to the formula p u r, the actual power when the light is turned on is greater than the rated power, so the filament is easy to burn out at the moment when the light is turned on. Take the bulb of "220V100W".
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