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Chapter 28 - 28.7
+
ir
=12V+(0
.
040 Ω)(50 A) = 14 V.
(b)
P
=
i
2
r
=(50A)
2
(0
.
040 Ω) = 100 W.
(c)
P
=
iV
= (50 A)(12 V) = 600 W
.
(d) In this case
V
=
E
ir
=12V
−
(0
.
040 Ω)(50 A) = 10 V and
P
=
i
2
r
= 100 W
.
7. (a) The potential difference is
V
=
E−
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