Page 133 - Basic Electrical Engineering

Figure 2.29

Solution:

We will take one reference node at zero potential. Generally the node at
which maximum branches are meeting is taken as the reference node. Let R is

the reference node as shown in Fig. 2.30. The reference node will be called
ground node or zero potential node.

Figure 2.30

Points F, G, R, H, I are at zero reference potential. Let us now assign
potential at all nodes with respect to the reference node. Let V , V , V , V E
D
B
C
are the potentials at points D, B, C, and E, respectively. Let us also assume
unknown currents I , I , I , I , and I flowing through the branches.
5
2
I
3
4
Applying Ohm’s law currents I , I , I , I , and I are expressed as
5
4
1
2
3
or,