re: amps and watts and volts, oh my...
26 dec 1997
>several of the small appliances i have show amps and volts on their
>labels, but not watts. how can i (or can i at all) compute the watts
>in order to analyze how much electricity the appliance uses?
multiply volts times amps. however, things with motors and fluorescent
lights and computers and some other creatures have a power factor that
isn't 1, so you have to multiply that product by 0.8 or so. and some
like coffeemakers list the maximum power consumed, with all the bells
and whistles active, vs the average power, when they are in repose.
if this is a serious hobby, you can buy a used kilowatt-hour meter for
about $30 from herbach and rademan at (800) 848-8001, email@example.com,
http://www.herbach.com, and measure the power exactly.
nicholson l. pine system design and consulting
pine associates, ltd. (610) 489-0545
821 collegeville road fax: (610) 489-7057
collegeville, pa 19426 email: firstname.lastname@example.org
computer simulation and modeling. high performance, low cost, solar heating and
cogeneration system design. bsee, msee. senior member, ieee. registered us
patent agent. solar closet paper: http://leia.ursinus.edu/~physics/solar.html
web site: http://www.ece.vill.edu/~nick