I recently bought a Kill-a-Watt meter to measure power consumption of my devices. This was just a fun project for me. I put this on my Mac-Mini to see power consumption during various usage states – idle, MATLAB bench mark, starting an application, screen-saver etc. and discovered that the power factor my my Mac-Mini was 0.2 when on standby and .80+ when up and running. However, while shutting down and before login the power factor was .45
I also measured this for my:
Raspberry pi with a 5v 3A power supply (PF=0.68) Dell Laptop 90W charger (PF=.98) 2006 Compaq Charger (PF=.55) CFL Table Lamps (PF=.52) Tube CFL Lamps (PF=.55) Power PC Late 2005 (PF=) A 40W Audio Amplifier (PF=.66) Vacuum cleaner (PF=.97) Samsung phone charger (PF=.58).
From what I learned in my classes, 0.9+ is a good power factor and utility companies fine industries if they have power factors less than this. But most household equipment seem to have terrible power factors. Yet I have never heard of utility companies fining residential users? Why? Do they correct the power factors at the transformers at our residence? Or is residential usage too meager to bother about?