Two-loop Circuit
Given:
Find:
110
1
R
?
1
I
40
2
R
?
3
I
30
3
R
50
4
R
V
v
6
1
V
v
8
2
The circuit in the figure is composed of two batteries (
E
1
= 6 V and
E
2
= 8 V) and four resistors
(
R
1
= 110
,
R
2
= 40
,
R
3
= 30
, and
R
4
= 50
) as shown.
(a) What is the current
I
1
which flows through
R
1
?
(b) What is the current
I
3
that flows through
R
3
?
Solutions
a.)
To find
I
&
we can use the following formula:
1
3
I
We need to write three equations (two with voltage and one with currents)

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