Which factor can lead to potential voltage drop when using electrical extension cords?

The length of the cord is a significant factor that can lead to potential voltage drop when using electrical extension cords. As the length of the cord increases, the resistance within the wire also increases. This resistance can cause a decrease in voltage by the time it reaches the end of the cord, particularly under load. The longer the distance electrical current must travel through the cord, the more energy is lost, resulting in a noticeable reduction in voltage.

In contrast, factors such as the color of the cord, material type, or brand may influence other properties of the extension cord, such as insulation or flexibility, but they do not have a direct relationship with voltage drop in the same way that length does. The material type might affect the overall conductivity, but it is the length of the wire that primarily dictates how much resistance and subsequent voltage drop occurs when using extension cords.