How many watts equal one horsepower?

One horsepower is equivalent to 746 watts. This conversion is based on the definition of horsepower as a measure of power that can perform work at a specific rate. The term was originally coined by James Watt in the 18th century to compare the output of steam engines to the power of draft horses. The standard conversion factor of 746 watts to one horsepower originated from this historical context and remains applicable in both imperial and metric systems today.

This understanding is crucial for electrical trade practices, as it allows for accurate calculations in electrical loading, motor sizing, and energy consumption estimates. When working with electric motors or other machinery, knowing how to convert horsepower into watts facilitates better decision-making regarding power requirements and efficiency.

Other choices do not match the established conversion metric for horsepower to watts, which can lead to misconceptions in calculations related to power output in electrical applications.