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DirectCurrent Circuits
117
(b) The total power input to the circuit is
()
( )
12
1.50 V
1.50 V
0.600 A
1.80 W
input
I
εε
=+ =
+
=
P
( )
2
2
0.600 A
0.255
0.153
0.147
loss
Ir r
=+
=
Ω
+ Ω
=
P
Thus, the fraction of the power input that is dissipated internally is
W
0.147 W
0.0816 or 8.16%
1.80 W
loss
input
==
P
P
18.25
Applying Kirchhoff’s junction rule at junction
a
gives
(1)
Using Kirchhoff’s loop rule on the upper loop yields
III
(
3
) ( )
13
.0
4.0
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This document was uploaded on 10/20/2011.
 Spring '09
 Physics, Current, Power, Work

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