Figure 7: Light Bulb A&B in Parallel Figure 8: Series Parallel Light B Calculations and Graphs Theoretical Reg Req = R 1+ R2 = 330 ? + 560 ? = 890 ? This equation was used to find the Theoretical R of the first circuit. Using the val eq from the Measured resistor in the series circuit. Req = R1 R2 / R1+i R 2