In my application I've to calculate power of I/P signal(signal ranges 100-300V, 5-20/5-30/10-40A).my controller has built in ADC,by which am sampling both voltage and current to find out the peak value and phase.Latter calculating power as follows:
power=(Vpeak*Ipeak*Cos(angle))/2
Does it correct way or please suggest any other method using some available chip,because there is a chance of missing exact peak value