Parameters for calculating the graphic resistance of 3.0 V–0.25 A Bulb 1(R0 = 1.8 Ω) and 3.0 V–0.25 A Bulb 2(R0 = 1.8 Ω) from the measured current flowing through Bulb 1 and Bulb 2 in a simple electric circuit with Bulb 1 and Bulb 2 connected in series.