What is defined as the voltage or current value at its maximum points?

The term that defines the voltage or current value at its maximum points is the peak value. This value represents the highest level of a signal, whether it's voltage or current, during a single cycle. Specifically, in alternating current (AC) signals, the peak value indicates the maximum amplitude the waveform reaches. This concept is particularly important in electrical engineering and telecommunications, where understanding the maximum potential of a signal can influence the design and effectiveness of circuits and devices.

The crest value is closely related to the peak value and often used interchangeably, but it sometimes has specific connotations in various contexts. The root mean square (RMS) value is used to describe the effective value of an AC waveform and is calculated differently from the peak value, providing a different insight into the current or voltage levels. The average value refers to the mean level of the waveform over one full cycle and is not the same as the peak; it usually results in a lower numerical value than the peak in AC waveforms. Thus, peak value is the most accurate description of the maximum current or voltage.