In video #321, we looked at DC current sensors. Today we will look at how to measure AC mains currents, which is much more difficult. And more dangerous because it can kill you if you do not pay attention. And, because measuring AC power is useful in home automation, we will also look at how to measure voltage and calculate power. To measure correctly, we have to learn about phase shifts and power factor. And I will tell you the essential rule to live long around high voltages. I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, EEVblog, and others Links: Mains checker: HCPL3700: ZMPT101B: Dimmer: Current Transformer: UT204A: or PZEM-004T: or Sonoff POWR2: or Shelly EM and 3EM: Power Monitor: Lots of interesting stuff: Dimmer Library: Library for ZMPT101B: DSO213 Oscilloscope (update from my 203): The links above usually are affiliate links which support the channel (no additional cost for you). Supporting Material and Blog Page: Github: My Patreon Page: Discord: If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission (of your purchases the next 24 hours) to buy new stuff for the channel My shop: For Banggood For AliExpress: For : For Amazon UK: For : %20Spiess/ Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my primary job As an Amazon Associate, I earn from qualifying purchases