A 750 W motor drivers a pump which lifts 300 litres of water per minute to a height of 6 meters. The efficiency of … (B) 40% (C)…
Answers:
Correct option (B) 40%
Explanation:
Mgh = 300 × 10 × 6
Pi = mgh/t = (300 × 10 × 6)/60 = 300W
P0 = 750 W
Ƞ = (300/750) × 100 = 40%