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:1RT1R11R21R31R41RT1418116141RT4162161164161116RT16111.45WSimplifiedFormulasTotal resistance of equal resistors in a parallel circuit is equal to the resistance of one resistordivided by the number of resistors.RTRNwhereRT= total resistanceR = resistance of one resistorN = number of resistorsExample: Five lamps, each with a resistance of 40W, are connected in parallel. Find totalresistance.RR1R2R3R4R540WN5RTRN4058WES-02 Page 34 Rev. 0
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