Re: how can i calculate the AC power used by any appliance like fan?
https://www.consumerreports.org/cro...ergy-monitors/overview/energy-monitors-ov.htm is a review on wattmeters, you could use the cheaper one as a check on your data collected. P = VI, so with known wall voltage you should be able to caclulate power from your current measurements. You can use a hall effect sensor to measure the current.