From a website (that probably copied from anoter website or a book):
horsepower:
James Watt (1736 - 1819) observed that the average horse of his time could move a 550 pound weight one foot in one second, thereby performing work at the rate of 550 foot pounds per second, or 33,000 foot pounds per minute, for an eight hour shift, more or less. He then published his observations, and stated that 33,000 foot pounds per minute of work was equivalent to the power of one horse, or, one horsepower.
foot-pound:
One foot-pound is the amount of force required to move one pound one foot
torque:
The turning power of a shaft
foot-pound of torque:
One foot-pound of torque is the rotational force necessary to support a one pound weight one foot from the fulcrum of a weightless bar
A full rotation of a one pound weight one foot from the fulcrum of a weightless bar is equivalent to moving that weight 6.2383 feet [radius ® of the circle = 1 foot & circumference = 2Pi x r ] and therefore equates to 6.2382 foot pounds of force
You do the math!
Also,
Power measured in Kilowatts (kW)
Torque measure in Newtonmeters (Nm)
For all the non imperial speaking countries
Mr C