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Oct 21, 2004, 11:04 AM
Alphabandaid

Formula for Watts?


Watt is the formula for measuring wattage?
I'm attempting to teach myself the relationships of the variables involved.
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Oct 21, 2004, 11:07 AM
me move stick helicopter go up
Here's a great tool: http://www.angelfire.com/pa/baconbacon/page2.html
Oct 21, 2004, 11:31 AM
gwh
gwh
Registered User
Watts = Volts * Amps
Oct 21, 2004, 03:47 PM
DVA
DVA
DVA
mecanical watts are

Power= 2*pi*rpm*T/60 [W]
T in N-m

or

Power= 2*pi*rpm*T*746/(60*550)
T in ft-lb
there is about 746 W in one hp and 550 ft-lb/s in one hp

DVA
Oct 21, 2004, 03:52 PM
Registered User
Quote:
Originally Posted by aplphabandaid
Watt is the formula for measuring wattage?
I'm attempting to teach myself the relationships of the variables involved.
V=IR,P=VI.My lecturer at college once said that the use and understanding of these two apparently simple statements comprises 50% of electrical engineering,everything else comprises the other 50%.A bit of an egsageration perhaps .But you get his point once you start to dabble
I repeat. V=IR P(watts)=VI
Oct 22, 2004, 09:59 AM
Alphabandaid
Okay, thanks. Now to see if my old brain can digest this. thanks much all.
Oct 22, 2004, 01:12 PM
Registered User
http://www.grc.nasa.gov/WWW/K-12/Sam...w/ohmslaw.html

This might be of interest :-)
Oct 22, 2004, 03:24 PM
Gotta have more cowbell!!
MTwallet's Avatar
Quote:
Watts = Volts * Amps
If, in the odd occurance you don't know the voltage but do know the current and resistance you can still find "P" (watts). P = (I*I)*R It might be hard to apply to motors, but it works on circuits.


Mike


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