What is one major disadvantage of DC current?

The choice highlighting that DC current experiences increased resistance over longer distances is significant due to the nature of electrical conduction. In a direct current (DC) system, as the distance from the power source increases, the energy losses due to resistance in the wires also increase, leading to voltage drops. This phenomenon occurs because DC current flows in one direction and is subject to resistive losses that accumulate along the length of the conductor.

This characteristic can pose challenges for applications requiring long-distance power distribution since the efficiency drops as resistance becomes a larger factor. Therefore, higher resistance over distance means more energy is lost as heat, necessitating thicker conductors or more energy input to maintain adequate voltage levels, which can complicate system design and raise costs. Understanding this property of DC is crucial when considering applications in which distance is a factor, such as in electrical systems for vehicles, marine applications, and other industrial uses.