P28_012.PDF

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Chapter 28 - 28.12
E 2 −E 1 ) / ( r 1 + r 2 + R )for R :
R = E 2 −E 1
i
r 1
r 2 = 3 . 0V
10 3 A
2 . 0V
3 . 0Ω
3 . 0Ω=9 . 9
×
10 2 .
1 . 0
×
(b) P = i 2 R =(1 . 0
×
10 3 A) 2 (9 . 9
×
10 2 Ω) = 9 . 9
×
10 4 W.
12. (a) We solve i =(
 
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