Direct Current and Transient Analysis 111
R.2.51 When two (or more) electrical elements, denoted by A and B, share the same volt-
age, that is, they are connected between the same two points, they are referred to
as connected in parallel, as illustrated in the Figure 2.4.
R.2.52 A current IT divides between two resistances R 1 and R 2 connected in parallel into I 1
and I 2 , the respective currents as indicated in Figure 2.5. Then the branch currents,
I 1 and I 2 , can be expressed in terms of the resistances R 1 , R 2 , and the current IT by
the following relation known as the current divider rule:
IT = I 1 + I 2
I
R
RR
1 2 IT
12
I
R
RR
2 1 IT
12
FIGURE 2.2
An electric loop (KVL).
V 1 + V 2 = V 3 + V 4
+
V 3
−
+
+
+
−
V 2
V (^4) −
−
V 1
FIGURE 2.3
Series connection.
AB
I I
I
FIGURE 2.4
Parallel connection.
ABV