Re: Basic AC wattage question: am I doing my math right?
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Sat, 29 Dec 2007 09:01:18 +1100
"HC"
Hey, Tim, thank you for your response.
** Don't thank someone for supplying bad advice.
The device is a television that is plugged in but not
turned on.
** Then your test method is completely worthless.
Somewhere I once read that the power consumption of
televisions that are plugged in but not turned on is still significant
** So you prefer vague and false information.
If the number I've come up with is 0.0496 kWh per day and if working
the number in a more precise way as you have alluded to (considering
power factor and whether or not the device is subject to the
reactivity of AC) would only get me maybe 10% more precision then my
number is fine for my purposes.
** The likely error is hundreds of percent.
Not using a true rms meter means your amp reading may well be out by factor
of 2 or 3.
The power factor of the load is also unknown and can alter the result by
similar factor.
A special wattmeter is needed measure the standby energy consumption of such
an appliance.
See the one in the pic here:
http://sound.westhost.com/articles/external-psu.htm#test
...... Phil
.
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