A pulsed DC signal is characterized by its ability to switch between positive and negative voltages while maintaining a non-zero average value over time. This means that, although the signal fluctuates, it does not drop to zero, allowing it to provide a consistent level of power. Such signals are widely used in various applications, including power supplies, where they can efficiently deliver energy, and in motor control systems, where precise voltage control is necessary. Additionally, in telecommunications, pulsed DC signals can carry information alongside power, making them versatile for different technological needs.