Comparison of percent error between the total voltage Vt [V] and current It [A] measured and the total voltage VtC [V] and current ItC [A] calculated in the electric circuit in which Bulb 1(R0=1.8 Ω) and Bulb 2(R0 = 1.8 Ω) are connected in series when the graphical resistance of the bulb is applied to the operating resistance of the bulb.