RMS value

The value obtained by converting alternating voltage/current into the equivalent direct voltage/current that performs the same amount of work. The calculation method involves squaring the instantaneous values of the AC waveform, integrating over one period, dividing by the period, and then taking the square root of the result. For example, in the case of a sinusoidal AC voltage, if the peak value (maximum value) is Vm, the RMS value Ve is expressed by the following formula.

Ve = Vm / √2

In everyday life, this value is commonly used to indicate the magnitude of AC voltage or current. For example, the 100V from a household outlet is the RMS value, and the peak value is √2 times that, which is 141.4V.