When testing voltage on an AC circuit, the reading on the LCD will ___.

In an AC circuit, the voltage can fluctuate due to the nature of alternating current, which changes direction and magnitude periodically. The voltage reading observed on an LCD meter while measuring AC voltage can vary as the current alternates. This fluctuation can arise from several factors, such as the frequency of the power supply, the load on the circuit, and any interference or differences in the phase angle. Therefore, a reading that fluctuates on an LCD meter reflects the dynamic behavior of AC voltage, which is a typical characteristic of how AC circuits operate.

This understanding highlights the essential nature of AC circuits and helps in diagnosing and troubleshooting electrical systems. In contrast, a constant reading would be more characteristic of a DC circuit, where voltage remains steady, while a significant drop or no reading usually indicates circuit issues, such as open circuits or failed connections. However, in normal operating conditions for AC systems, fluctuation is expected.