In an AC voltage signal, how many peaks does each cycle have?

In an alternating current (AC) voltage signal, each complete cycle consists of two peaks. Specifically, one peak corresponds to the positive half of the cycle, where the voltage increases to its maximum positive value before returning to zero. The second peak occurs during the negative half of the cycle, where the voltage decreases to its maximum negative value before returning again to zero.

This characteristic is fundamental to AC signals, which oscillate between positive and negative values, creating a symmetrical shape typically represented by a sine wave. Therefore, the correct understanding of an AC cycle is that it contains both a positive and a negative peak, totaling two peaks per cycle.