Why tungsten in bulb breaks down automatically after sometime??
Kindly give correct answer otherwise I will report
Answers
Question:-
Why tungsten in bulb breaks down automatically after sometime??
Eventually the filament becomes thinner. Filaments also become brittle with long use. ... The light of an incandescent bulb is offered by one filament of tungsten which, with a current inside, becomes incandescent and emitting light. This process makes the tungsten sublimates, becoming thinner and thinner until it breaks.
hope it helps you..
Answer:
Tungsten becomes thinner after using continuously. Light bulb filaments are extremely flimsy things. They have to be to made very thin to emit light when carrying their rated current. Not only are they extremely thin, they are wound in a double helix, a helix of nichrome wire that is already a helix. This is what it takes to make the filament glow sufficiently to emit light in sufficient quantities and whiteness. So, the filament is on the verge of destruction when it is manufactured. During use, it has to be raised to such a high temperature that small amounts of the filament “sputter” off the filament. If the sputtering is extremely uniform, the light bulb lasts a long time. However, more than likely there is some minor defect in the filament at some point that causes it to have less cross sectional area than other parts of the filament. That would cause that point in the filament to have more resistance than the rest of the filament. Therefore that place in the filament will glow brighter and hotter, than the balance of the filament. Being hotter, brighter, and more resistance than the rest of the filament will make that place be the one that continues to deteriorate faster than other places. This can’t go on forever, so eventually that weak place with the minimum cross section, and the maximum heat is unable to support the condition, finally gives in to the stress, with a break.
HOPE THIS BRING A SMILE IN YOUR FACE
Explanation: