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.
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.
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Newton meter per second = watts per sconds
ReplyDeleteWrong...
DeleteCorrect one is NM/S is equal to joule/second.
Joule = Newton metre (work done)
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