Question

In this circuit, which resistor will draw the least power? will draw inside!!

A. R_1
B. R_2
C. R_3
D. the power will be the same for each resistor

Answer 1

here the current is:
I=12/(2.2+1.1+2.7)=...amperes

Answer 2

2!

Answer 3

ok!

Answer 4

now the power dissipated by R_1 is:
P_1= R_1 * I^2= 2.2* 4=...

Answer 5

8.8!

Answer 6

ok!
the power dissipated by R_2, is:
P_2= R_2 I^2 = 1.1* 4=...watts

Answer 7

4.4!

Answer 8

ok! finally the power dissipated by R_3, is:
P_3 = R_e*I^2 = 2.7*4=...watts

Answer 9

oops..
P_3= R_3* I^2

Answer 10

10.8!

Answer 11

ok! reassuming, we have these dissipated powers:
P_1=8.8 watts,
P_2=4.4 watts
P_3=10.8 watts
which is the littlest value among them?

Answer 12

P2! so is choice B our solution?

Answer 13

correct!

Answer 14

yay!! thanks!:)

Answer 15

:)