Re: Watt meters

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve Zeitler" <zeitler-at-verizon-dot-net> 


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, March 15, 2004 6:49 PM
Subject: Re: Watt meters


 > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >
 > At 08:08 AM 3/15/2004 -0700, you wrote:
 > >Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com>
 > >I have two residential electric (energy) meters. These
 > >are the ones that are used to calculate my power bill.
 > >I assume these can be used with a stop watch to
 > >calculate KW? How do they calculate PF?
 >
 >
 > They don't calculate or measure PF.. they measure (only) active power.
You
 > could measure the apparent power (combination of active and reactive
power)
 > with a RMS voltmeter and RMS ammeter and then calculate the PF from PF=
 > (active power)/(apparent power)
 >
 >
 > >Do they assume
 > >a certain inductive load? For inductive load, a normal
 > >house normally only has HVAC, Refrigerator/Freezer,
 > >and Washer/Dryer. Garage door openers, etc. are
 > >probably insignificant.
 > >
 > >Adam
 >
 >
 > I assume the actual power used by a TC is more complex than using an
amprobe and multiplying the amp reading by the input voltage. The coil cap
causes a big reactive current that flows in and out of the circuit but is
not consumed. right?
not to mention the ragged waveform.
how does one measure the actual power using simple equipment?
                                                    Steve Z