Wednesday, 14 October 2015

proof of 1 hp = 746 watts

    Proof of 1 hp equal to 746 watts

HP = Horsepower 

    HP and Watts are both units of power. Power can be electric or mechanical, and can be converted between the two. Any conversion will be less than 100 % efficient.

It is only for historic reasons that electrical power is measured in Watts not hp, like the way that tyre widths are in mm but rim diameter are in inches.

One pound is 4.44822 Newtons


so 550 foot pounds per seconds, converted to metric, is 550 x 0.3048 x 4.44822 Newton meters per second, which is 745.7 Newton meters per second, better known as Watts.



One foot is 0.3048 metres


1HP = 550 Foot Pound per second 

1 Pound = 4.44822 Newtons

1 Foot is 0.3048 Meters.

1 HP = 550 * 4.44822 * 0.3048 meters

1Hp = 745.69 Newton meter per second. 

A 1 hp motor cannot use less than 745.7 Watts so if it uses 1 kW it is about 75% efficient, which sounds about right for a motor of that size.





One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts. 

* A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts. 

* A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9,809.5 watts. 

* One horsepower for rating electric motors is equal to 746 watts.

* A Pferdestärke is a name for a group of similar power measurements used in Germany around the end of the 19th century, all of about one metric horsepower in size.

* An RAC horsepower or British tax horsepower is an estimate based on several engine dimensions.

See More 


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12 comments :

  1. Newton meter per second = watts per sconds

    ReplyDelete
    Replies
    1. Wrong...
      Correct one is NM/S is equal to joule/second.

      Joule = Newton metre (work done)

      Delete
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  5. Michael R. Kesti15 October 2020 at 14:58

    There is nothing concerning efficiency in the conversion.

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