At what degree does the maximum negative voltage occur in a sine wave?

In a sine wave, the maximum negative voltage occurs at 270 degrees. To understand why this is the case, it's helpful to visualize how a sine wave is constructed on a graph.

A standard sine wave starts at 0 degrees, where the value is 0. As you move to 90 degrees, the sine value reaches its maximum positive peak, which is +1. Continuing to 180 degrees, the value returns to 0 as the wave completes half of its cycle. At 270 degrees, the sine value reaches its maximum negative peak, which is -1. Finally, at 360 degrees, it returns to 0, completing the cycle.

This progression illustrates that the negative peak is achieved just before the sine wave returns to zero after going through one complete cycle. Understanding the phase relationship is key: the sine wave’s negative maximum falls at 270 degrees, confirming that this point on the graph represents the deepest downward point in the cycle.