(3 38) and hence,
V
V
V
I r
AB
A
B
≡
=
(
) �
( )
ε1�
1
(3 41)
Similarly,
V
V
V
I r
BC
B
C
≡
=
( ) �
( )
ε2�
2
(3 42)
Hence, the potential difference between the terminals A and C of the
combination is
( )
( )
( )
( )
AC
(A)–
(C)
A –
B
B –
C
V
V
V
V
V
V
V
≡
=
+
 
 
 
 
 
 
 
 
       
(
)
(
)
1
2
1
2
– I r
r
ε
ε
=
+
+
(3