Question

Which device is used to convert AC into DC. State it’s underlying principle and explain its working. If the frequency of input AC to this device is 60 Hz, then what will be frequency of the output of this device.

Answer 1

Rectifier

Underlying principle of Rectifier 

The basic principle of the rectifiers is the transformation of current by changing the frequency of the input signal, and diodes are used to do this.

Working

In rectifier, one end of terminal which is connected to PN junction diode will never have negative potential, as it allows current in forward biasing only. Hence potential difference across load resistor will always be Positive or zero.

For 60 Hz input of AC, output of

Half wave rectifier will be 60Hz

Full wave rectifier will be 120 Hz