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Table of Contents:

**Rotating Horsepower (HP) = T * (N / 5252) Watt**

**Where,**

T - Torque

N - Speed

Horsepower refers to a unit of power that is equal to 550 foot-pounds (745.7 watts). Horsepower is the power of an engine that is measured. Horsepower is defined as work done over time. Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation.

The SI unit of horsepower is Watt. Horsepower was first used by James Watt, who employed it to compare the power of steam engines with that of horses.

Horsepower (hp or HP) is the name of several non-SI units of power (watt). It was originally defined to allow the output of steam engines to be measured and compared with the power output of draft horses.

**Example:**

Calculate the Rotating Horsepower for the given details.

Torque = 5 pound-foot

Speed = 10 revolution per minute

**Solution:**

**Apply Formula:**

Rotating Horsepower (HP) = T * (N / 5252) Watt

Rotating Horsepower (HP) = 5*(10/5252)

Rotating Horsepower (HP) = 5* (0.00190)

**Rotating Horsepower (HP) = 0.00952018278750952 Watt**