Question

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

Answer 1

are P_1, P_2 and P_3 the dissipated powers?

Answer 2

yes i believe so!

Answer 3

across each resistor, the voltage drop is 12 volts

Answer 4

now the current in R_1 is:
12/2=...

Answer 5

6!

Answer 6

and the power P_1, is_
P_1= 12*6=...

Answer 7

72!

Answer 8

ok! Now the current into R_2 is:
12/8=...

Answer 9

1.5!

Answer 10

and the power P_2 is:
8*1.5=...

Answer 11

12!

Answer 12

ok so that means so far, P1 > P2 ? how do we find P3?

Answer 13

ok! Now the current into R_3 is:
12/5=...

Answer 14

oh okie! err we get 2.4!

Answer 15

ok! and the power P_3 is:
P_3= 12*0.24=...

Answer 16

wait is it 12*2.4?

Answer 17

since 12/5=2.4?

Answer 18

sorry, yes! 12*2.4=...

Answer 19

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?

Answer 20

ok! correct!

Answer 21

yay!! thank you!!:)

Answer 22

:):)