What is the peak voltage value measured from?

The peak voltage value is defined as the maximum electrical potential difference measured within a waveform, specifically referencing the highest point in the voltage cycle. It is calculated from zero, which represents the baseline of the waveform, up to the peak, where the voltage reaches its maximum. This measurement is crucial in alternating current (AC) circuits since it indicates the extreme amplitude of the waveform, essential for determining other values like RMS (Root Mean Square) voltage.

In contrast, the other options do not accurately represent the definition of peak voltage. The average value to maximum relates more to the calculation of average voltage levels rather than a direct measurement from zero. The comparison between phase and line voltages pertains to multi-phase systems and the relationships between different types of voltage, which do not directly relate to peak voltage measurement. Lastly, RMS to DC discusses the conversion metrics between different voltage types without addressing how peak voltage is measured from a baseline.