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Homework Help: Investigation of resistance of Lightbulb

  1. Mar 31, 2009 #1
    1. The problem statement, all variables and given/known data

    I am currently carrying out an investigation into all the factors that affect the resistance of a lightbulb. Firstly, I have done a graph to show voltage against resistance for a 24W Lightbulb to see if Watts affect resistance, however my friends and teacher all told me to do it as current against voltage, but what is the point when the investigation is asking me to find out the factors that affect resistance? Also, how does watts affect resistance and what is watts exactly.
    Another problem is that I need to have precise and reliable data in order to get the high grades, but I don't know how I can get precision and reliability with just a "power pack, filament lightbulb, wire, variable resistor, two multimeters..."?
    Please help, thanks
  2. jcsd
  3. Mar 31, 2009 #2


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    Homework Helper

    Welcome to PF.

    This lecture might be useful at about 17:20 in, though actually the whole lecture might be helpful.:

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