anonymous
  • anonymous
Which of the following statements is true about the circuit shown? A. P1 > P2 > P3 B. P2 > P3 > P1 C. P1 > P3 > P2 D. P1 = P2 = P3
Physics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Michele_Laino
  • Michele_Laino
are P_1, P_2 and P_3 the dissipated powers?
anonymous
  • anonymous
yes i believe so!

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Michele_Laino
  • Michele_Laino
across each resistor, the voltage drop is 12 volts
Michele_Laino
  • Michele_Laino
now the current in R_1 is: 12/2=...
anonymous
  • anonymous
6!
Michele_Laino
  • Michele_Laino
and the power P_1, is_ P_1= 12*6=...
anonymous
  • anonymous
72!
Michele_Laino
  • Michele_Laino
ok! Now the current into R_2 is: 12/8=...
anonymous
  • anonymous
1.5!
Michele_Laino
  • Michele_Laino
and the power P_2 is: 8*1.5=...
anonymous
  • anonymous
12!
anonymous
  • anonymous
ok so that means so far, P1 > P2 ? how do we find P3?
Michele_Laino
  • Michele_Laino
ok! Now the current into R_3 is: 12/5=...
anonymous
  • anonymous
oh okie! err we get 2.4!
Michele_Laino
  • Michele_Laino
ok! and the power P_3 is: P_3= 12*0.24=...
anonymous
  • anonymous
wait is it 12*2.4?
anonymous
  • anonymous
since 12/5=2.4?
Michele_Laino
  • Michele_Laino
sorry, yes! 12*2.4=...
anonymous
  • anonymous
ooh okie! so we get 28.8! so we have this? P1=72 P2=12 P3=28.8 so P1 > P3 > P2 so choice C is our solution?
Michele_Laino
  • Michele_Laino
ok! correct!
anonymous
  • anonymous
yay!! thank you!!:)
Michele_Laino
  • Michele_Laino
:):)

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