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    dx4530's Avatar
    dx4530 Posts: 37, Reputation: 1
    Junior Member
    		  
    #1

    Jun 18, 2012, 10:13 PM
    Why doesn't a bulb s/c ?
    If the correct explanation of a short circuit is that when theirs a very low resistance conductor in the circuit then why doesn't the regular incandescent light bulb create a short ?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #2

    Jun 19, 2012, 03:58 AM
    dx4530: It's all in the math and the physics...
    a 60 watt lamp has a resistance of ~240 ohms so it draws about 1/2 an ampere... P=I^2 x R
    If you Google the definition you'll find a few, mostly similar.
    The definition of a short circuit, IMO, should include the description of a circuit
    where an unintended connection occurs before the intended load...

    A short circuit in a residential environment for example, with a 50 kVA transformer mounted on the pole may allow as much as 12,000 amperes of current to flow in what is called a phase to phase bolted fault or short circuit... This is deadly, ask any squirrel!
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