How many degrees are in one complete AC voltage cycle?

One complete AC voltage cycle corresponds to 360 degrees. This is because an alternating current (AC) waveform, such as a sine wave, completes a full oscillation over a span of 360 degrees. The cycle begins at zero volts, rises to a peak (90 degrees), drops back to zero volts (180 degrees), reaches a negative peak (270 degrees), and finally returns to zero volts (360 degrees), thereby completing the cycle.

Understanding this concept is fundamental in electrical engineering and applications involving AC circuits, as it allows for analysis of waveforms, phase relationships, and the overall behavior of AC systems. The significance of the 360 degrees highlights how time and frequency relate to phase and voltage changes in AC currents, which is crucial for designing and troubleshooting electrical systems.