Basic DC Theory DC CIRCUIT ANALYSISFigure 43 Node PointBy solving node equations, we can calculate the unknown node voltages. To each node in acircuit we will assign a letter or number. In Figure 44, A, B, C, and N are nodes, and N and Care principal nodes. Principal nodes are those nodes with three or more connections. Node Cwill be our selected reference node. VAC is the voltage between Nodes A and C; VBC is thevoltage between Nodes B and C; and VNC is the voltage between Nodes N and C. We havealready determined that all node voltages have a reference node; therefore, we can substitute VAfor VAC, VB for VBC, and VN for VNC.Rev. 0 Page 55 ES-02
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