**There are many ways to measure the power of a motor block of cars, motorcycles and air-conditioners . So is a 100 horsepower car with the power of 100 horses?** **The answer is no.**

Horsepower is a unit of measurement for measuring power, simply understood as the speed of completing a job. For example, if you are pushing a heavy object from the top of the slope to the top of the slope, then the power here is the speed you complete it.

**The term power** was coined by Scottish engineer Jame Watt to compare the power of steam engines versus - horse power of horses. It was later expanded to apply the output power of car piston engines, turbines, electric motors and many other machines.

Many people believe that horsepower equals the maximum power of a horse generated. However, this is a wrong assumption. Through measurement, it is confirmed that a horse can produce maximum effort up to 14.9 horsepower. For comparison, 1 person has the ability to produce up to 5 horsepower.

And according to James Watt's regulation, **horsepower is equal to the amount of energy that a horse can maintain over a period of time** . However, up to now there have been several variations of the concept of horsepower.

Unlike other measurement quantities, the exact definition of horsepower may depend on each region and again depending on how energy is measured in a particular machine.

Formula for calculating horsepower.James Watt's definition of horsepower is called **mechanical horsepower (also known as imperial horsepower)** and is approximately equal to 745.7 Watt. However, there is another 'horsepower' called **Pferdestarke (also known as PS or metric horsepower)** , which is also based on the same measurement of James Watt but developed in Germany and equivalent to 735.5 Watt.

Horsepower of the electric motor is equivalent to 746 Watt. Horsepower of steam boilers is different and 1 horsepower of steam boilers is equivalent to 9810 Watt.

For those who wonder where the number 745.7 above. The capacity of a machine according to James Watt is defined as Cong required to lift 1kg of mass to 1 meter high in 1 second, in short, 1 horsepower = 75 kgf⋅m / s.

In many European countries still use this calculation. This method is still used in the United States, but because Pound and Foot are used, it will be defined as 33,000 ft⋅lbf / min.

Again, add these two calculations based on choosing the value of gravitational acceleration g = 9.80665 / 2. And if in another attraction, such as on the Moon, 1 horsepower is only 1/6 compared to below Earth.

**Particularly in the car sector, there are differences when car manufacturers in different countries measure horsepower** . In the UK, people often measure engine power with brake horsepower, abbreviated bhp. In the US, meanwhile, likes to calculate engine power in horsepower.

On the other hand, we are talking primarily about **the horsepower of the generated engine** . However, when installing a 100 horsepower engine on a car, through many powertrain systems, the actual capacity when coming to the wheel is no longer so.

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