P28_011.PDF

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Chapter 28 - 28.11
11. From V a −E 1 = V c
ir 1
iR and i =(
E 1 −E 2 ) / ( R + r 1 + r 2 ), we get
V a
V c =
E 1
i ( r 1 + R )
( r 1 + R )
=
E 1
E 1 −E 2
R + r 1 + r 2
4 . 4V
(2 . 3Ω+5 . 5Ω)
=4 . 4V
2 . 1V
5 . 5Ω+1 . 8Ω+2 . 3Ω
=2 . 5V .
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