Electric Circuits 8th Edition 141

# Electric Circuits 8th Edition 141 - 4.9 S...

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When Eq.4.54 is satisfied for the circuits in Flg.4.36, tle curenl itr Rr is the same for both circuits in tle figure for all values of Rr. If the current through R. is the samein botl circuits5 then the voltage drop across R, is the same ir both circuitq and tle circuits are equivalent at nodes a.b. lf lhe polarily of d. is reversed. rhe orie0rarion olir mu<t be reversed to mahtaitr equivalence, Example 4.8 illustmtes the usefulness of making source ftamforma- tions to simplify a circuit-analysis problem. Using Source Transformations to Solve a Circuit a) For the circuil showr in Fig.4.37, find the power associated wifi the 6V souce. b) State whether the 6 V source is absorbitrg or delivedng the power calculated in (a). Solution a) ff we study the circuit show! ill Fig. 4.37, knowitrg rhat lhe power asqociated witb fte o V source is of interest, several approaches come to mind, The circuit has four essential nodes and six essential branches where the curent is unlnown, Tnus we
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