Re: Re: Re: Re: Re: Proper Horse Power Conversion Calculations
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Posted by peter on September 06, 1998 at 05:03:45:
In Reply to: Re: Re: Re: Re: Proper Horse Power Conversion Calculations posted by big fred on August 31, 1998 at 06:57:05:
: : : Metric power is measures in kilowatts and Imperial power is measured in horsepower. there is 746 watts to one horsepower or 746 watts = 1 horsepower : : Peter, I don't disagree that you can convert a horse power to kilowatts for use as a standard however, the real units of a horse power before conversion to another standard are still force,distance and time. For example if by hand I raise a bucket of water out of a well in a specific time I can calculate the horsepower it took to do that because I know the force(or weight ) , the distance , and the time. Knowing only these three things you are out of luck as far as putting the calculated HP in terms of Watts.However, if You now hook a motor to the rope and raise the same weight the same distance in the same time while measuring the motor voltage and current ( and knowing the motor effiency) you can calculate the Watts required to generate the same power. You can therefore make the conversion. The only point I am making is that the basis for all horsepower measurement is a mechanical measurement of force,distance, and time.John : John, the watt is used by most engineers I know as the one unit of power in SI units, whether mechanical, electrical or thermal. It is equal to one Newton-Meter/Sec, with a Newton being one Kilogram-meter/second squared. My Mark's engineering handbook lists a metric horsepower also, and the conversion is 1 hp = 1.014 metric hp. Until I looked up metric horsepower this morning, I had never heard of it. Learn something new every day. Now what do you suppose is the origin of the metric horsepower? Thanks for the support big fred. everyone in this discussion appears to RIGHT. I think we may be just speeking slightly different languages. I am in Australia terminology may be a bit different but what everyone has said is quite correct. I have been teaching this stuff for about 10 years.
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