1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Energy dissipated over time by resistors

  1. Mar 21, 2012 #1
    1. The problem statement, all variables and given/known data

    In the figure below, R1 = 9.00 , R2 = 23.0 and the ideal battery has an emf = 12.0 V.

    hrw7_27-71.gif

    (a) 0.24 A

    (b) How much energy is dissipated by all four resistors in 1.00 min?

    3. The attempt at a solution

    Not sure where I went wrong.

    P = inet2Rnet

    P = i12R2 + i22R2 + i32R2 + i42R1

    P = (0.24)2(23)+(0.24)2(23)+(0.24)2(23)+(0.24)2(9)

    P = (0.24)2(23+23+23+9)

    P = 4.4928 J/s

    P = dW/dt

    4.4928 = dW/60s

    dW = (4.4928)(60)

    W = 269.568 J
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 21, 2012 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    I suspect you calculated Rnet incorrectly, and I get something different for inet than you.

    If you show how you calculated Rnet, we might be able to spot the error.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Energy dissipated over time by resistors
Loading...