Mathematicaly that is correct, but wwhat we are doing with rms mesurements is creating a value that we use in power calculations such that the result of vrms X Irms X PF =
vdc x I dc the ccomplexitys in this stem from non sinusoidal wave shapes. Remember that the first power meters were heaters . The scientists recognised that it did not matter if the source was ac or dc if the heart output was the same, by inference the voltage and current should be the same in the same heater Terry