Question: what is irms and vrms?
Answer: RMS power is indeed Vrms*Irms for a single phase circuit, which yours seems to be. Your Irms = Ipeak divided by the square root of two. Vrms = Vpeak divided by the square root of 2, hence 3/1.414 = 2.12 volts. ... Then multiply Vrms times Irms and that is your power in terms of rms.