Req = R1 R 2/ R1+ R 2+ R3 (330 ? )(560 ? )/(330 ? + 560 ? )+ 100 = 307.64 ? This equation was used to find the Theoretical R of the third circuit. Using the values and R, from the measured resistor in the simple series parallel circuit. Ra = R 4+ R6 = 100 ? + 330 ? = 430 ? Rb = RaR s/ Ra + Rs = (430 ? ) (560 ? ) / (430 ? + 560 ? ) 243.23 ? Rc = Rb + R =243.23 ? + 330 ? = 573.23 ? Rd =RcR /Rc R = (573.23 ? )(560 ? ) / (573.23 ? + 560 ? ) = 283.27 ? Req = Rd +R = 283.27 + 100 =383.27 ? These are the equations used to find the Theoretical R of the fourth circuit. Using valu from the measured resistor values in the complex series parallel