98 Techniques of CncLrit AnaLysis 1f,) Figure 4.6 A The cncuit shown jn Fig. 4.5 with a rcference node and the node voltages. 10v the most branches is usually a good choice. The optimum choice of the ref-erence node (if one exists) wi become apparent after you have gained ^ some expefience using lhi\ method. In rhe circuir sboqD iD fig.4.5. rbelq lo\rer node connect5 rhe mosl branchel so $e use ir as Lhe reference node. We flag the chosen reference node with the symbol V,as in Fig.4.6.Atter selecting the reference node, we define the node voltages on thecircuit diagram. A nod€ volfage is defined as the voltage rise from the ref- erence node to a nonreference node, For tlis circuit, we must define two node voltages, which are denoted ol and 2'2 in Fig- 4.6.
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Trigraph, Electrical network, Kirchhoff's circuit laws, wayf rom