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Old Oct 21, 2004, 10:04 AM
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Alphabandaid
Marshfield, Wisconsin, United States
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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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Old Oct 21, 2004, 10:07 AM
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me move stick helicopter go up
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Here's a great tool: http://www.angelfire.com/pa/baconbacon/page2.html
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Old Oct 21, 2004, 10:31 AM
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gwh
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Watts = Volts * Amps
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Old Oct 21, 2004, 02:47 PM
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DVA
Chandler, AZ
Joined Jul 2004
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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
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Old Oct 21, 2004, 02:52 PM
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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
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Old Oct 22, 2004, 08:59 AM
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Alphabandaid
Marshfield, Wisconsin, United States
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Okay, thanks. Now to see if my old brain can digest this. thanks much all.
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Old Oct 22, 2004, 12:12 PM
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http://www.grc.nasa.gov/WWW/K-12/Sam...w/ohmslaw.html

This might be of interest :-)
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Old Oct 22, 2004, 02:24 PM
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Clawson, MI USA
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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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