In AC, one complete cycle corresponds to how many degrees of rotation?

In AC, one complete cycle corresponds to how many degrees of rotation?

• A. 180 degrees
• B. 360 degrees
• C. 90 degrees
• D. 270 degrees

Answer: (B)

In AC, one complete cycle means the waveform has advanced through a full progression and returns to the same point in its pattern. A sinusoidal voltage or current repeats every 360 electrical degrees (2π radians) of phase, so the cycle spans 360 degrees. That’s why 360 degrees is the right answer. Remember this is the electrical angle; how this maps to mechanical rotation depends on the machine’s pole count—two poles give one electrical cycle per turn, more poles change that ratio.

In AC, one complete cycle means the waveform has advanced through a full progression and returns to the same point in its pattern. A sinusoidal voltage or current repeats every 360 electrical degrees (2π radians) of phase, so the cycle spans 360 degrees. That’s why 360 degrees is the right answer. Remember this is the electrical angle; how this maps to mechanical rotation depends on the machine’s pole count—two poles give one electrical cycle per turn, more poles change that ratio.