Answers

2014-12-13T11:11:06+05:30
Thomas alva edison had invented the electric bulb. he had used many products for the filament including his hair atlast he used tungesten. uin this experiment he wasted over 4000$. it works when the circute is complete. its filled with argon, or krypton gases.
its filament gets fused when it gets over heated.
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2014-12-13T11:29:08+05:30
The inventor Thomas Alva Edison  experimented with thousands of different filaments to find just the right materials to glow well and be long-lasting. In 1879, Edison discovered that a carbon filament in an oxygen-free bulb filled argon glowed  for  long hours. Subsequently he could produce a bulb that could glow for over 1500 hours and hence the commercial production started in 1880.
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