# 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
**E**_{b}= 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%.