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Power dissapatied by a resistor

  1. Jul 16, 2009 #1
    1. The problem statement, all variables and given/known data

    How much power is dissipated by R1 resistor? (R1=15 W, R2=25 W, V=9 V.)


    2. Relevant equations



    3. The attempt at a solution
    Since it is a series 1/Req=(1/R1)+(1/R2)

    Then I=V/R= .96 A

    so Then i just simply plugged in I in P=I^2R which is apparently wrong, but I thought this is right. What am i doing wrong?

    Attached Files:

  2. jcsd
  3. Jul 16, 2009 #2


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    Science Advisor
    Homework Helper

    You are right, the resistors are in series. So why are you using the Req formula for resistors in parallel?
  4. Jul 16, 2009 #3
    ......let me get back to you
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