A generator produces 240 volts at 25 amperes. If the mechanical and electrical power losses total 900 watts,?

Question

what is the efficiency of the generator? Need formula and solution.

Answer 1

Theoretical output of generator = V x I  Watts

Therefore   240 x 25 = 6000 watts

Actual output  = 6000 - 900   = 5100 Watts

efficiency   =   output / input

% efficiency =  output / input  x 100 = (5100 / 6000)  x 100

Efficiency     =  85 %

Answer 2

With only output voltage and current given, we will need to assume that this is a DC generator or a single phase AC generator operating at power factor = 1.0. In those cases, power = voltage X current, 240 V X 25 A = 6000 Watts. The input power is output power plus losses or 6900 W.Efficiency = output power / input power or 6000 / 6900 = 0.87 or 87%.