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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.)

    Resistor.jpg

    2. Relevant equations

    I=V/R

    P=I^2R

    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

    Dick

    User Avatar
    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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