Question

What is the power dissipitation in an ac circuit in which voltage and current are given by V=300sin(wt-pi/2) and I=10sin(wt)

Answer 1

V(peak)= 300 volts
so V (rms_ = 300/ under root(2)
similarly I(rms) = 10 / underroot(2)
now power= V(rms) * I(rms)= 3000/2 = 1500 watts