What is the RMS value of voltage?

The RMS value of a fluctuating voltage or current is its effective value. The corresponding steady DC constant value produces the same effect.

How does RMS voltage become calculated?

For a sinusoidal waveform, the RMS voltage V_RMS is calculated by multiplying the peak voltage value by 0.7071, which is equal to one divided by the square root of two.

What is the difference between RMS and peak voltage?

Peak values can be computed using the above formula’s RMS values, which means  V_P = V_RMS × √2, provided the source is a pure sine wave. Thus, the peak value of the mains voltage is approximately 120 × √2, or approximately 170 volts. The peak-to-peak voltage is around 340 volts.

Formula

RMS Value determined from Peak Value: V_P

V_RMS = 0.7071 x V_P

RMS Value determined from Peak to Peak Value: V_PP

V_RMS = 0.35355 x V_PP

RMS Value determined from Average Voltage Value: V_AV

V_RMS = 1.11 x V_AV

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