Concept of Horsepower in Cars
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23 March, 2009 : In general term, horsepower is defined as the rate of doing work. When talking about cars, it is the rate at which car’s engine is able to perform its function.
The term horsepower was invented by the engineer James Watt (1736 - 1819) who is known for his extraordinary work on improving the performance of steam engines. According to Watt, one horse can perform 33,000 foot-pond of work in one minute. So, if taken an example of a horse raising pounds of coal from the coal mine, a horse exerting 1 horsepower can raise 330 pounds of coal to 100 feet in a minute or 33 pounds of coal to 1,000 feet in one minute, or 1,000 pounds of coal to 33 feet in one minute. The three different situations generate different horsepower. Hence different combinations can be used to have a certain horsepower as long as the product is 33,000 foot-pounds in one minute. Similarly, even car manufacturers can choose different combinations of fuels and technologies to generate the expected horsepower.
Horsepower can be converted into different units depending on the requirement. Some of the significant unit changes of horsepower are:
- 1 horsepower is equal to 746 watts.
- 1 horsepower over the time span of one hour is equal to 2,545 BTU (British thermal units). BTU is the amount of energy required to increase the temperature of 1 pound of water at 1 degree F.
- 1 BTU is equal to 1,055 joules, or 252 gram-calories or 0.252 food Calories.
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