Question

What is one horsepower?
(A) $1000W$
(B) $500W$
(C) $764W$
(D) $746W$

Answer 1

Hint Horsepower is a unit of Power. The short form for horse power is hp. This is a unit in foot – pound – second (fps). It is sometimes used to show at what rate mechanical energy is spent.
It is equal to $ \equiv 33,000ftlbf/\min $

Complete step-by-step answer:
Horsepower is a unit of measurement of Power. The definition for horsepower is the rate at which the work is done. It is denoted by hp. It is used to show the power of engines. It is usually used in reference to output of the engines or motors. There are many different types of horsepower:

- Mechanical hp
- Metric hp
- Electrical hp
- Boiler hp
- Hydraulic hp
- Air hp

All horsepower has different values.
The horsepower is a unit in foot pound second. The power level of 1 horse power is approx. equivalent to $746W$(Watts) or $0.746kW$(kilo-Watts).

So, the option (D) is the correct answer

Note The horsepower describes the power of an engine. To specify the power in cars, the term horsepower is used.
In the case of an engine dynamometer, power is measured at the engine's flywheel.