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What is the effect of tungsten filament aging on current?

April 26, 2017aging Filament Tungsten

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What is the effect of tungsten filament aging on current?

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As tungsten filaments age, grain boundary etching and the development of porosity [near the end of life, a cross-section of the filament resembles Swiss cheese] within the filament occurs. Because of this, the resistance increases during life so the current decreases at constant volts. However, the current decrease is not significant and therefore would not affect the lamp in normal operation.