ABYC Marine Electrical Practice Exam

How many watts are equal to one horsepower?

1. 546 watts

2. 746 watts

3. 1000 watts

4. 500 watts

The correct answer is: 746 watts

One horsepower is defined as equivalent to 746 watts. This standard measurement is used primarily in the context of engines and motors, where horsepower is a common unit of power used to indicate the engine's ability to do work. The watt, being the basic unit of power in the International System of Units (SI), provides a consistent measure across various applications, including electrical and mechanical systems. Understanding this relationship between horsepower and watts is crucial for making informed decisions in marine electrical practices. For instance, when selecting motors or generators, knowing the conversion between these two units can help ensure that the power output meets the operational requirements of the vessel. Additionally, historical and practical applications of horsepower and watts can often lead to confusion, especially in discussions about engine outputs and electrical loads. Recognizing that 746 watts equate to one horsepower allows for accurate calculations when equating electrical power requirements with mechanical output, ultimately enhancing efficiency and performance when operating marine vessels.