Which type of voltage maintains the same magnitude but can vary in other aspects?

The type of voltage that maintains the same magnitude but can vary in other aspects relates to Direct Current (DC). In a DC circuit, the voltage remains constant over time, which means that, while the voltage level doesn't fluctuate, it can be applied at different levels depending on the circuit requirements.

In contrast, Alternating Current (AC) does not maintain a constant magnitude; instead, its voltage varies sinusoidally over time. High voltage and low voltage refer to the range of voltage levels but do not imply consistency in magnitude. Therefore, the specific characteristic of DC being a constant voltage makes it the correct choice for this question.