The percentage efficiency of the motor should be high as possible because it cause less pollution as it needs less input of diesel or petrol.
First law of the thermodynamics:
It says that the energy neither produced nor destroyed, energy changes its form, from one form to another.
Every moving object losses some energy,
Efficiency:
Therefore, the percentage efficiency of the motor should be high as possible because it cause less pollution as it needs less input of diesel or petrol.
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