20250201_000445587
At room temperature, the nominal resistance of the filament of a 25W 230V lamp is 170-174 Ohms. As you can see in my video, the resistance of the filament of the lamp you sent is almost 250 Ohms, which is almost one and a half times more than the nominal value. This clearly indicates that the filament is thinned due to evaporation of tungsten.
At room temperature, the nominal resistance of the filament of a 25W 230V lamp is 170-174 Ohms. As you can see in my video, the resistance of the filament of the lamp you sent is almost 250 Ohms, which is almost one and a half times more than the nominal value. This clearly indicates that the filament is thinned due to evaporation of tungsten.