explain the hp of a motor.?

Question

not with equations. theoritically

Answer 1

Horsepower (hp) is the name of several non-metric units of power. In scientific discourse, the term "horsepower" is seen as inferior and is rarely used because of its various definitions and the already existent SI unit for power, the watt (W). However, use of the term "horsepower" persists as a legacy in many languages and industries, particularly in the automotive industry because of their continued advertising of maximum power output of internal-combustion engines in "horsepower" units of measurement.

There are two important factors to consider when evaluating the measurement of "horsepower":

The inconsistent definitions of the "horsepower" unit itself
The various standards used in measuring the value of "horsepower"
These factors can be combined in unexpected ways — the power output for an engine rated at "100 horsepower" might not be what a reader expects. For this reason, various groups have attempted to standardize not only the definition of "horsepower" but the measurement of "horsepower". In the interim, more confusion may surface.

The following definitions have been widely used:

Mechanical horsepower ≡ 33,000 ft·lbf/min
= 550 ft·lbf/s
= 745.69987158227022 W (exactly)

Metric horsepower ≡ 75 kgf·m/s

= 735.49875 W (exactly)

Electrical horsepower ≡746 W
Boiler horsepower ≡ 33,475 Btu/h
=9809.5 W

Hydraulic horsepower merely mechanical horsepower; can be calculated by multiplying the specific units of US gal/min times pressure in psi (lbf/in²) then dividing by 1714

Additionally, the term "horsepower" has been applied to calculated (estimated rather than measured) metrics:

RAC horsepower is based solely on the dimensions of a piston engine (1 liter of engine displacement is equal to 10 RAC horsepower)

Answer 2

A horse power is a unit of work. One horsepower equals 1 pound pulled up 550 feet, or a 550 pound block pulled up to a height of 1 foot- the same amount of work has been done.

Electrically, a horsepower is equal to about 750 watts. A vacuum cleaner is about 1/2 horsepower.
The wifes hair dryer is about 1 and a half horsepower give or take a bit.

Gas engines, are funny critters- the engine manufacturer wants to sell you the biggest engine for the most amount of money. Which means they're not exactly honest on how big of a motor you really need.

A 12' alumium Smokercraft boat, is rated for about 7.5 HP, and will burn roughly 1 gallon an hour at max speed of around 17 knots.

A 40' Cruise-a-home houseboat, normally has 2 each inline 6 cylinder gasoline engines, each producing around 110 HP, for a cruising speed of around 18 knots, and drinking 10 gallons per hour, give or take a bit.

Answer 3

All horsepower is the comparable. regardless of in case you call in 746 watts, 746 joules consistent with 2d, or 550 feet lbs/2d. what's diverse is the torque curve. electric autos generate the main torque whilst they are status nevertheless, and generate much less torque as they velocity up. regularly velocity x torque = means. because of the fact E-autos generate greater torque as they decelerate there is not any administration situation. With gasolline engines it is diverse. there's a optimum horsepower velocity in RPM and a optimum torque velocity in RPM that's often under the HP max. in case you run the engine against an expanding load so it slows decrease than the max torque RPM it is going to by surprise loose RPM and stall till you shift gears, and so on. because of the fact as you pass slower the hollow between torque mandatory to maintain velocity and accessible torque widens..... Boiler HP and shaft HP are diverse purely like Engine HP and Brake HP... Now Boiler HP is the warmth value inclusive of waste from changing from organic thermal means to mechanical action >> Shaft HP in ships as an occasion. In autos it is referred to as engine HP vs Brake HP. In sorting out autos a "brake" is used to degree the HP on the rear wheels after the water pump, radiator fan, transmission losses, rigidity line bearings, and differential have had their bite of means....

Answer 4

hp -how much work an engine (or whatever) can do.

torque - is how much work it does do.

http://www.straightdope.com/mailbag/mhorsepower.html

http://www.car-videos.net/articles/horsepower_torque.asp