### The input of the single phase half wave rectifier is 60 W whereas the output is 24 W. Find out rectifier efficiency and power efficiency.

**Solution**

### Rectifier efficiency

= ( Output DC Power / Input AC
Power ) × 100%

= ( 24 / 60 ) × 100%

= 40%

### Power efficiency

- The input of the single half wave rectifier is 60 W , it means that 30 W for positive half cycle and remaining 30 W for negative half cycle.
- As the single phase half wave rectifier conducts only for half cycle therefore only 30 W for positive half cycle is converted into 24 W and remaining 6 watts as loss.

**Power efficiency **

= ( Output DC Power / Half of Input
AC Power ) × 100%

= ( 24 / 30 ) × 100%

= 80%

*Therefore the rectifier efficiency is 40% whereas the
power efficiency is 80%.*

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