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Light globe brightness change with voltage

  1. Oct 28, 2012 #1
    1. The problem statement, all variables and given/known data

    If a 6v incandescent globe is running at 6v with 0.6amps has a 0.909 resistor introduced into it's circuit which drops the voltage across it to 5.501v and 0.55amps how much does the brghtness change?

    3. The attempt at a solution

    5.501*0.55/6*0.6 original brightness. Is it as simple as this? Because I know globes are a non-ohmic conductor.
     
    Last edited: Oct 28, 2012
  2. jcsd
  3. Oct 28, 2012 #2

    CWatters

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    There is enough information in the question to allow you to calculate if the resistance has changed.

    I believe your approach is correct (eg ratio of power) but perhaps add what other assumption you have to make about a bulbs brightness.
     
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