Horsepower is still used alongside the SI unit watt in many technical manuals
PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
Horsepower is still used alongside the SI unit watt in many technical manuals.
(i) Explain, with one relevant example, why the horsepower unit continues to be quoted for certain classes of machines despite the adoption of SI units.
(ii) A micro-mechanical device on a research bench releases energy at an average rate of 2.8×10^−5 W. Express this power in an appropriate sub-multiple of watt and justify your choice of prefix.
(iii) An industrial gas turbine produces 18.6 MW of power. Express this rating in horsepower and comment on the scale difference between the micro-device and the turbine.