1 HP is equivalent to how many watts?

Correct option is D

1. Definition of Horsepower

1 horsepower is defined as:

• Work done = 550 foot-pounds per second (in FPS system)

This was based on the average work a horse could do.

2. Conversion to Watts (SI Unit)

Since electrical and mechanical systems use watts (W) as the standard unit of power, we convert HP to watts.

1 HP=550 ft

Now converting to SI units:

• 1 ft = 0.3048 m
• 1 lb = 4.448 N

1 HP=550×0.3048×4.448 W

3. Standard Approximation

1 HP≈746 W

This is the accepted engineering value.