FCC Exam Question: 3-13B3

746 watts, corresponding to the lifting of 550 pounds at the rate of one-foot-per-second, is the equivalent of how much horsepower?

A. One-quarter horsepower.
B. One-half horsepower.
C. Three-quarters horsepower.
D. One horsepower.
Correct Answer:

Explanation: One mechanical horsepower is defined as the power required to lift 550 pounds a distance of one foot in one second. The question explicitly states that 746 watts corresponds to this exact rate of work (lifting 550 pounds at one-foot-per-second). Therefore, by definition, 746 watts is the equivalent of exactly one horsepower. This conversion factor (1 HP = 746 watts) is fundamental in physics and engineering, including amateur radio when discussing transmitter power output. Options A, B, and C represent fractions of this defined relationship.

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Includes Elements 1, 3, 6, 7R, 8, and 9.