Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Filament light globe current

  1. Mar 28, 2004 #1
    Hi there,

    can anyone pls explain why
    1. the current through a filament light globe is greater in the first few milliseconds after it is turned on before it reaches it's "steady" glow?

    2. is it better to have headlights in a motos vehicle connected in parallel rather than in series?

    greatly appreciated!
    Cseet
     
  2. jcsd
  3. Mar 28, 2004 #2

    Integral

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    1. filliment resistance is temperature depentent.

    2. In series one goes out both go out. In parallel they go out one at a time.


    You do realize we have a homework help forum?
     
  4. Mar 28, 2004 #3
    The resistance of an electrical conductor varies with it's temperature.

    Wired in series, if one headlight failed, the current would no longer be conducted to the other headlight.
     
  5. Mar 28, 2004 #4
    RE: resistor

    Hi there,

    thanks for your help.

    I now realised that there's a homework help section... I'm new to this forum. thanks again
    cseet
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook