GED Science Practice 2026 - Free GED Science Practice Questions and Study Guide

Horsepower is a unit of measurement that quantifies the power output of engines and motors. Originating in the 18th century, it was devised to compare the output of steam engines to that of draft horses. Specifically, one horsepower is defined as the ability to do 550 foot-pounds of work per second, highlighting its application in measuring how efficiently a motor or engine can perform work over time. This context makes it particularly relevant in industries where engine performance is crucial, such as automotive and machinery.

The other options refer to entirely different concepts. The first option discusses organic compounds, which relates to chemistry and biochemistry rather than power metrics. The second option is linked to hydroelectricity, which pertains to energy production but does not define a measurement of power. The final option describes tropical cyclones, a meteorological phenomenon, which is unrelated to mechanical power measurements. Thus, focusing on the role of horsepower solidifies its relevance specifically in evaluating the operational capacity of engines and motors.