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Resistance and Power Probelm (again)

  1. Jan 26, 2009 #1
    A light bulb is wired in series with a 132 resistor, and they are connected across a 120 V source. The power delivered to the light bulb is 23.4 W. What are the two possible resistances of the light bulb?

    a. lower value
    b. higher value

    relevant equations V=I/R and P=(I^2)(R)

    attempt at soultion:




  2. jcsd
  3. Jan 26, 2009 #2


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    You have two resistors in series (the 'resistor' and the bulb )
    What do you know about the current through these two resistors?
    What equations do you know for the total resistance ?
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