a
મોટર વડે મળતો આઉટપુટ પાવર \( = \,\,\frac{{{\text{mgh}}}}{{\text{t}}}\,\, = \,\,\frac{{(30\,\, \times \,\,1000)\, \times \,\,9.8\,\, \times \,\,40}}{{15\,\, \times \,\,60}}\)

કાર્યક્ષમતા \(\, = \,\,\frac{{{\text{Out}}\,\,{\text{put}}\,\,{\text{power}}\,\,{\text{of}}\,\,{\text{motor}}}}{{Power\,\,consumed\,\,by\,\,motor}}\,\, \times \,\,100\,\)

\( \Rightarrow \,\,30\,\, = \,\,\frac{{30\,\, \times \,\,1000\,\, \times \,\,9.8\,\, \times \,\,40}}{{15\,\, \times \,\,60\,\, \times \,\,P}}\,\,\, \times \,\,100\)

\( \Rightarrow \,\,\,\,P\,\, = \,\,\frac{{9.8\,\, \times \,\,1000\,\, \times \,\,40}}{{15\,\, \times \,\,60}}\,\, = \,\,43.55\,\, \times \,\,{10^3}W\, = \,\,43.6\,\,kW\)