The efficiency of the DC motor at maximum power is

The efficiency of the DC motor at maximum power is

Right Answer is:

Less than 50%

SOLUTION

Why efficiency of D.C motor is below 50%

  • The DC motor develops maximum power when the Back EMF is half the applied voltage is Eb = V/2.
  • Practically it is not possible to develop an exact 50% of maximum power because in that case, the current would be much beyond the rated current of the motor.
  • Some of the energy is wasted in the form of heat and other losses. Therefore motor efficiency is below 50%.
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