The Physics Factbook™
Edited by Glenn Elert -- Written by his students
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|Bibliographic Entry||Result |
|Cutnell & Johnson. Physics Third Edition. New York: Wiley, 1995: 182.||"Thus, the average speed is v = 11.5 m/s, and the average power is P = Fv = (5060 N)(11.5 m/s) = 5.82 × 104 W (78.0 hp)."||58 kW|
|Science and Technology Desk Reference. Second Edition. Detroit: Carnegie Library of Pittsburgh, 1996: 376.||"A typical automobile requires about 20 horsepower to propel it at 50 mi (80.5 km) per hour."||15 kW|
|Automobile Technology. Second Edition. San Diego: Harcourt Bruce Jovanovich, 1992: 432.||"Within the power range required to drive an automobile (about 20-200 kW for passenger vehicles and 20-300 kW for commercial vehicles)."||20-200 kW|
|1909 Model T. Michigan Historical Center. Henry Ford Museum and Greenwich Village. 1909 Ford Model T. 1999.||"The vehicle was comprised of a 4-cylinder, "L"head engine, a 2-speed, planetary transmission, had horsepower of 20, weighed 1,200 pounds and cost $850."||15 kW|
|"Most Powerful Car." Guinness Book of Records 2001. New York: Guinness, 2001: 135.||"The most powerful production car on the market is the McLaren F1 6.1, which develops an excess of 627 hp."||468 kW|
The power of a car is very important when one looks into aspecific vehicle. When we watch or read a car advertisement, theynever fail to mention the horsepower of the vehicle. The horsepowervaries in different types of cars. One thing is common in allcars; the engine within the car is the producer of the power tomove the vehicle. The power is available from the engine crankshaftafter a fuel, usually gasoline, is burned in the engine cylinders.
Most automotive vehicles are powered by a spark-ignition four-stroke-cycleinternal combustion engine. Some passenger cars and trucks havediesel engines. Other types of engines include the steam engineand gasoline engine. Automotive engines can be supercharged orturbocharged, which may increase engine power up to 50%. Thisenables a small engine to perform like a naturally aspirated largerengine. Thus, the power of a car may vary no matter what the sizeof the car may be.
Horsepower is the common unit of power. Power is the rate atwhich work is done. Because the power of the car is describedin horsepower, it must be converted to watts in order to get theinternational unit. One horsepower is equivalent to 746 watts.
Jae-hee Joh -- 2001
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