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Resistor Problem involving Lightbulbs

  1. Mar 22, 2015 #1
    1. The problem statement, all variables and given/known data
    We have 6 lightbulbs that are identical attached to a battery, and we need to list them from brightest to dimmest.

    This is what they look like.
    2mgsN9o.png

    2. Relevant equations

    None...?

    3. The attempt at a solution

    So, my thinking is that bulbs 6,1,2 are the brightest and the same, because the same amount of current is flowing through them, then I think that 3 is brighter than 4 and 5 which are equal...

    This is wrong and I dont know why.
     
  2. jcsd
  3. Mar 22, 2015 #2

    mfb

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    2016 Award

    Staff: Mentor

    I agree with your answer. Why do you think it would be wrong?
     
  4. Mar 22, 2015 #3
    I dont know. As long as someone agrees with this, I'll talk to my teacher.
     
  5. Mar 22, 2015 #4

    SammyS

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    Staff Emeritus
    Science Advisor
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    Gold Member

    Yes, you are correct.
     
  6. Mar 24, 2015 #5
    Hello my friend
    Your answer is correct. Brightness of bulbs is proportional power of them.
    P=R×I×I
    Therefore brightness of bulbs:
    6,1,2(are same)>3>4,5(are same)
     
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