General exam question G5B07

WhyThe RMS value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value. The RMS (root-mean-square) value of an AC waveform is specifically defined as the AC value that dissipates the same average power in a resistor as a DC voltage of that same numeric value, which is exactly why RMS is the standard way AC voltage and current ratings are expressed, answer C. The peak-to-peak and peak values are larger than the equivalent heating value, and the reciprocal of RMS isn't a meaningful power-equivalent quantity, so A, B, and D don't fit the definition.