48. (a) We use
P
=
ε
2
/
R
eq
, where
( )( )
()
(
)
eq
12.0
4.00
7.00
.
12.0
4.0
12.0
4.00
R
R
R
R
ΩΩ
=Ω
+
+Ω
+
Ω
Put
P
= 60.0 W and
ε
= 24.0 V and solve for
R: R
= 19.5
Ω
.
(b) Since
P
∝
R
eq
, we must minimize
R
eq
, which means
R
= 0.
(c) Now we must maximize
R
eq
, or set
R
=
∞
.
(d) Since
R
eq, min
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 Spring '08
 Any
 Physics

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