power
p=vi
i=Imsin(2πft) and v= Vmsin(2πft+θ)
p=VmImsin(2πft)sin(2πft+θ)
p=VIcosθ(1- cos2πft)+ VIsinθ(sin2πft)
For a purely resistive circuit
pR=VIcos(0°)(1 cos 2πft) +VIsin(0°) sin 2πft
=VI(1- cos 2πft)+ 0 or
=VI -VIcos 2πft
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