light bulb

Discussion in 'General Electronics Chat' started by RRITESH KAKKAR, Dec 17, 2015.

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  1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    [​IMG]
    THE LED require series resistance but in our home there is bulb ex. 60w,80w etc
    does not require R series ,why?
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    The bulb is just a resistance wire coiled up, as the bulb heats up its resistance increases, limiting its own current, whereas an led is a silicon diode that needs a limited current.
     
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  3. RRITESH KAKKAR

    Thread Starter Senior Member

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    why the R get increase on heating what is the use of gas?
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    The resistivity of the tungsten wire used for the bulb filament increases with temperature. It is a fundamental physical property of tungsten.
    The gas (if used) excludes oxygen so that the wire doesn't burn.
     
  5. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    The gas (if used) excludes oxygen so that the wire doesn't burn.
    what this mean sir?
    how we find tungsten?

    [​IMG]
     
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  6. Dodgydave

    Distinguished Member

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    The gas in incandescent lamps is usually Argon, or Halogen, as it does not burn.
     
  7. nerdegutta

    Moderator

    Dec 15, 2009
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  8. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    what this mean burn?
     
  9. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    actually how we see light?
     
  10. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    I am now convinced Ritesh is a troll. It took me 2,136 of his posts to figure this out. I'm getting old.

    [​IMG]
     
  11. OBW0549

    Well-Known Member

    Mar 2, 2015
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    I'm on the fence about that; right now, my money's on "(word removed by moderator)."

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    Last edited by a moderator: Dec 17, 2015
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  12. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    Let's just say he was banned at ETO for a reason.....
     
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  13. DickCappels

    Moderator

    Aug 21, 2008
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    Let's keep it polite. Nobody is forcing us to read any particular thread or post.
     
  14. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    No, we're not forced to read it but he's a troll nonetheless. Nobody's forcing us to read spam here either, but that's deleted on sight....
     
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  15. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Let me predict the nature of his next thread:

    "How does a wheel work?"

    ...

    "What is the definition of rolling?"

    ...

    "Why does it need an axel?"

    ...

    "What is an axel?"

    etc., etc.
     
  16. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    I didn't say he wasn't entertaining. And, as far as trolls go, he is one of the best around. Look at the volume of responses he is able to generate!
     
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  17. boatsman

    Senior Member

    Jan 17, 2008
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    Joeyd999
    Is that how you spell axle in the US?
     
  18. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    It's how he spells axle, but the rest of the US spells it a-x-l-e :D
     
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  19. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Embarrassingly enough, no. But I'm not putting much effort into this particular thread. I'll pay better attention in the future. Thank you for your concern.
     
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  20. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Ritesh next questions,,

    What means inert?

    What is light?

    How do we see it?

    How do my eyes work?

    Do i have a brain too?
     
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