BASIC DC CIRCUIT CALCULATIONSBasic DC TheoryExample 2: Now add a fourth resistance of 4W in parallel to the circuit in Figure 27. Whatis the new total resistance of the circuit?Solution:1R_{T}1R_{1}1R_{2}1R_{3}1R_{4}1R_{T}1418116141R_{T}4162161164161116R_{T}16111.45WSimplifiedFormulasTotal resistance of equal resistors in a parallel circuit is equal to the resistance of one resistordivided by the number of resistors.R_{T}RNwhereR_{T}= total resistanceR = resistance of one resistorN = number of resistorsExample: Five lamps, each with a resistance of 40W, are connected in parallel. Find totalresistance.RR_{1}R_{2}R_{3}R_{4}R_{5}40WN5R_{T}RN4058WES-02 Page 34 Rev. 0

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