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From: halle@hou2b.UUCP (J.HALLE)
Newsgroups: net.consumers,net.analog
Subject: Re: power meters
Message-ID: <450@hou2b.UUCP>
Date: Tue, 26-Mar-85 09:59:56 EST
Article-I.D.: hou2b.450
Posted: Tue Mar 26 09:59:56 1985
Date-Received: Wed, 27-Mar-85 03:45:30 EST
References: <1027@hound.UUCP>
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 8
Xref: watmath net.consumers:2039 net.analog:218

While it may be true that many on the net incorrectly think that an ammeter
measures power, an ammeter can be used to determine energy usage.
Power equals voltage times current.  Energy equals power times time.
V can be measured with a voltmeter elsewhere on the line with nominal
error, or can be estimated well enough at 110VAC.  An induction ammeter
(clip-on type) will measure the current.  (RMS or peak, depending on the meter)
A watch measures time.  Use all of these to estimate the consumption of a
particular appliance.  Or get a wattmeter.