What is the equivalent to the RMS value of an AC voltage?

The term RMS stands for Root Mean Square, which is a mathematical method used to express the effective voltage of an alternating current (AC) waveform. Because AC voltage constantly changes in amplitude and direction, a direct comparison to direct current (DC) is needed to measure its practical ability to do work. The RMS value of an AC voltage is defined exactly by this equivalent work: it is the AC voltage that will produce the same amount of heat dissipation in a given resistor as a DC voltage of the same numerical value. Distractors often confuse this by suggesting it is related to the average AC value or simply the square root of a peak value, but the core definition is always rooted in equivalent DC heating power.