One horsepower is equal to :

Horsepower (hp) is a unit of measurement for power, representing the rate at which work is done. The concept was popularized by James Watt in the 18^th century to compare the output of steam engines with the power of draft horses.

In the British Imperial System, one mechanical horsepower is defined as the power required to lift 550 pounds by one foot in one second. When converted to the International System of Units (SI), where power is measured in Watts (W):

1 hp ≈ 745.7 Watts

In standard physics textbooks and general science examinations, this value is typically rounded to 746 W. Other options like 100 W or 1000 W (which is 1 kilowatt) do not represent the standard conversion of one horsepower.