Basic DC Theory
DC CIRCUIT ANALYSIS
Figure 43 Node Point
By solving node equations, we can calculate the unknown node voltages. To each node in a
circuit we will assign a letter or number. In Figure 44, A, B, C, and N are nodes, and N and C
are principal nodes. Principal nodes are those nodes with three or more connections. Node C
will be our selected reference node. VAC is the voltage between Nodes A and C; VBC is the
voltage between Nodes B and C; and VNC is the voltage between Nodes N and C. We have
already determined that all node voltages have a reference node; therefore, we can substitute VA
for VAC, VB for VBC, and VN for VNC.
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