Nick wrote:
I recently got a ac current and power meter and something has become
apparent which makes me wonder if its significantly out of calibration... or
just the type of load.

It seems to measure pure resistive and most other loads accurately,
including those with SMPS like the TV / PC etc.

But try and measure a CFL or indeed any Fluorescent light and it is telling
me it is consuming about double the power it should be.

- The 60 watt circular kitchen lights each consume around 120 watts
- The dual 58 watt (116 watts) fluorescent lights takes approx 170 watts
- the 18 watt CFLs take approx 34 watts
In fact the Megaman 11 watt CFL has printed on it 96 mA
which is 230 x 0.096 = 22.08 watts

Can anyone explain ?


'power factor'