Given The instantaneous value of Voltage V = Vmsinωt = 20 sinωt = 20 V The instantaneous value of voltage I = Imsin(ωt + φ) = 10 sin(ωt + 60) = 10 A Phase angle φ = 60° Average Power delivered by an AC circuit Pavg = IRMS.VRMS.Cosφ Where IRMS = Im ⁄ √2 = 20 ⁄ √2 VRMS = Vm ⁄ √2 = 10 ⁄ √2 P=100 Watt