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Home / Meters, Communications & Site Analysis / Meters & Battery Monitors / Power Meters / Kill A Watt Electricity Usage Meter P4400 / Reviews / Understanding AC Metering
James Benya

Kill A Watt Electricity Usage Meter P4400

Written June 16, 2009

Understanding AC Metering

I have not tested the device personally, but asked to read the Paloma Hill review by a friend.

I read the review in which Hill measured the amps and volts used by a load and found the Kill A Watt meter to be reading low.

That is probably because AC power is NOT the product of volts and amps! It is the product of volts, amps and power factor. The power factor of a reactive load like a motor (including refrigerator compressors, AC compressors, furnace fans, etc.) is often 80% (0.80) or so. In other words, the Kill a Watt is accurate and Paloma Hills calculations are wrong.

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