Power cannot be RMS power. RMS is calculated by squaring the function's value, taking the average (mean value) of the squared function, and finally converting that mean value back by finding the square root of that mean. If we had a peak power of 100 watts with a 50% duty cycle the RMS power, if there was such a thing, would be SQRT( (100^2 + 0)/2) = 70.71 watts. We see that 70.71 watts is not the average power, is not the heating or "work" power, and is not the peak power. It isn't anything at all useful! We can have meters that read RMS voltage, and we can also have RMS current, but we don't read "RMS power" with any of our power measuring instruments. We can't even calculate RMS power to be anything useful or sensible at all.