ASVAB Skilled Technical Practice Test

Power is the rate at which work is done. One mechanical horsepower is defined as 550 foot-pounds of work per second. Converting that to watts gives about 745.7 watts. In practical use, this is rounded to 746 watts, which is why that option is the best match. The other numbers are less standard approximations, whereas 746 watts reflects the common engineering rounding for horsepower. (There are other horsepower definitions, like metric, which differ in watts, but for mechanical horsepower the standard rounded value is 746 W.)