# Power and Torque Equation

- What is Torque?
- Mathematical equation of torque?
- What is engine Horsepower?
- Mathematical equation of horsepower?
- Different between Horsepower and Brake-horsepower??

**Torque:**

Torque is a rotational or twisting force which apply onto any object to tighten or loosen it. The **Torque**, **moment**, **moment of force**, **rotational force** or “turning effect” is the rotational equivalent of linear force.

- Torque is represented by
**Newton Meters**in SI system, or by**foot-pound**in the British Imperial System.

**Mathematically equation**,

`T = F * r * sin (θ)`

- T total torque
- F ,the force applied.
- r is the distance from the pivot point to the point.
- θ is the angle between r and f

** For Example**:

If 10 pounds force is apply at the end of a wrench and the length of that wrench is 1-foot-long then the total **torque **will be** 10 pound-feet (10 lb-ft)/N-m**.

**Horsepower**

**Power** is the rate at which energy is expend or work will be done. Horsepower is mainly used in automobile and is equal to total power is losses is negligible.

In technical terms, Power is represent by** Joules per second** or a single unit **Watt**. In automotive terms is also represent by **horsepower**.

Horsepower is the force need to move 550 pounds one foot in a second, or 33,000 pounds one foot in a minute.

Dynamometer is use for measurement of Engine horsepower, but what the

dynamometerreally measure that is the total torque output of an engine, as well as the RPM – or “revolutions per minute”.

###### Mathematical equation:

- The constant 5252 is the rounded value of (33,000 ft⋅lbf/min)/(2π rad/rev).

- The constant 63,025 is the approximation of