Answers

2015-05-19T15:16:52+05:30
The filament of electric bulb is made up of tungsten . It's a good conductor of electricity . When current passes into the bulb , heat will be produced and the bulb becomes warm . 
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2015-05-19T15:19:40+05:30
When current passes through a bulb , heat will be produced due to the presence of tungsten metal . So , the glowing electric bulb becomes warm .
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