The root mean square (RMS) value of a waveform is the effective value of the current or voltage concerned. It is defined as the value of direct current or voltage that would produce the same power in a pure resistive load.
Assume that we are dealing with a voltage given by:
where Vm is the amplitude, maximum or peak value of the voltage waveform (see Figure 31.1). If this voltage is applied to a pure resistance, R, the current flowing will be given by:
As in Chapter 29, the ...