#### Hayee

##### Member level 3

I have to measure the Power (W). For that purpose I have AC voltage with zero crossing signal and AC Current. Both AC voltage and AC current waveform are full wave rectified.

To calculate the power we must know the power factor.

My question is can we calculate the power factor by using these 3 signals or I need zero crossing signal of AC current too to find out the time difference between them?

What I searched on the internet is that we need two zero crossing signal to calculate the time difference.

I want to know is there anyother way to do it?

I am using PIC18f452 microcontoller for power calculations.

Thanks