Which waveform represents 360 electrical degrees for an AC signal?

The sine waveform represents 360 electrical degrees for an AC signal due to its fundamental characteristics of alternating current. In a sine wave, one complete cycle is defined as moving from 0 degrees, up to +90 degrees (the peak), down to 0 degrees again (crossing the x-axis), continuing to -90 degrees (the negative peak), and back up to 0 degrees to complete the cycle. This entire motion corresponds to 360 degrees of electrical rotation.

The continuous, smooth oscillation of the sine wave is essential in power systems because it is the most efficient waveform for transmitting energy. It minimizes losses and is fundamental to the analysis of AC circuits, making it the primary waveform studied in electrical engineering. Other waveforms like square, triangle, and pulse may have their own utility in different applications, but they do not represent the same continuous cycle and phase relationships characteristic of the sinusoidal waveform.