Final answer:
The normal configuration of the DC system is not split-parallel. In a DC system, the source voltage is constant, while in an AC system, the source voltage varies sinusoidally.
Step-by-step explanation:
The normal configuration of the DC (direct current) system is not split-parallel like the AC (alternating current) system. In a DC system, the source voltage is constant, meaning it does not vary periodically. This is in contrast to an AC system, where the source voltage varies sinusoidally. In a DC system, the power is delivered in a single direction, while in an AC system, it alternates its direction periodically.