The Electric motor with given configuration has the percentage efficiency of 70%.
Motor Efficiency:
The ratio of the output (as mechanical work)of energy and the input of the energy( Electrical energy).
[tex]\bold {Eff = \dfrac {Wo}{Wi} \times 100}[/tex]
Where,
Ef - efficiency
Wo - Output work = 35,000J
Wi - input of enrgy = 50,00J
put the values in the formula,
[tex]\bold {Eff = \dfrac {35,000}{5000} \times 100}\\\\\bold {Eff = 70 \%}[/tex]
Therefore, the Electric motor with given configuration has the percentage efficiency of 70%.
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