Ans : British horse power is said to be the mechanical unit of power in F.P.S. system when it does the work at the rate of 550 ft lbs/sec or 33,000 ft lbs/min,
Metric horse power is said to be the mechanical unit of power in M.K.S. system when it does the work at the rate of 75 kg-m/sec or 4500 kg-m/minute.