Asked by Carlos Velazquez

determine the overall efficiency of a motor that deliveries 2 horsepower to a load if it draws 7.5 amperes when connected to a 240 volt supply.
Answered by Henry
Pi = E*I = 240 * 7.5 = 1800 W.

2hp * 746W/hp = 1492 W.

Eff. = Po/Pi = 1492/1800 = 0.829 = 82.9%.