The term horsepower originated with which figure and concept?

• A. It originated with James Watt to describe power a horse could do in one second.
• B. It originated with Isaac Newton to describe gravitational force.
• C. It originated with Leonardo da Vinci to describe energy.
• D. It originated with Galileo to describe motion.

Answer: (A)

Horsepower is a unit created to compare how much power an engine provides relative to what a horse can do in a given time. James Watt introduced the term by defining horsepower as the amount of work a horse could perform in one second. This framing makes power—the rate at which work is done—easy to relate to familiar animal effort. By convention, one horsepower equals 550 foot-pounds of work per second, about 746 watts. This historical idea gives a practical bridge between engine output and everyday experience with horses. The other figures—Newton, Da Vinci, and Galileo—are famous for laws of motion, gravity, and studies of movement, but they did not originate the term horsepower.