International Journal of Engineering and Information Systems (IJEAIS)   Year: 2021 | Volume: 5 | Issue: 2 | Page No.: 139-144 Theoretical Models to Voltage Drop of a Single-Phase Copper Conductor at 120 Volts One Way Distance and Maximum Current Loading. Olabimtan Olabode H, Ngari Adamu. Z, Itoro Obot, and Oduma Friday.O. Abstract: The theory of electrical voltage drop in electrical applications is a fundamental factor that critically requires a methodology that will technically prevent energy shortage and economy for maximum outputs. Models with direct parametric relationships were designed for the conductor (copper), maximum load current, net voltage, and the frequency (50Hz) at a maximum voltage of 230 volts single phase. The voltage drops were conceptualized with a constant maximum load current of 1 Ampere across a copper length from 10 to 55 meters, and at a constant copper wire distance of 10 meters from 1 to 10 Amperes. At 1 ampere maximum load current; the established relationship between the voltage drop (VD) and the distance of copper wire (CL) presents a polynomial model of VDv = (7×10-7)(CL)2 + (9 ×10-5); between the percentage voltage drop (VD%) and the copper wire length (CL) with a polynomial model of VD% = (-2 ×10-7)(CL)2 + (9×10-6) and between the net voltage (NV) and the copper wire length (CL) is also with a polynomial model of NV= (-7 × 10-7)(CL)2 + 120 all at R2 of 0.9990. At 10 meters length of the copper wire conductor, the interaction between the voltage drop (VD) and the maximum load current (LC) gives a linear model of VDv = 0.008(LC) + (4 × 10-5); between the percentage voltage drop (VD%) and the load current (LC) with a linear model of VD% = 0.006 (LC) + (5 ×10-5) and between the net voltage (NV) and the maximum load current (LC) was also with a linear model of NV = -0.008 (LC) + 120 at standard conditions (R2= 0.9990).