Download - Full wave rectifier
Aim
To understand the working of full wave rectifier using p-n junction diodes and to design a circuit diagram of half wave rectifier using step down transformer (220V AC – 12V AC), diodes, LED and suitable resistances.
Introduction and principle of a rectifier
Apparatus used
Step-down transformer (220V AC – 12V AC)
p-n junction diode (IN 4007)
Circuit board
Wires
9V battery and battery connector
LED (5mm, 1.5V)
Resistors
Push button type toggle switch
Theory and working
1.)Working of p-n junction diode in forward and reverse biasing
2.)full wave rectifier
3.)Circuit diagram used in making of full wave rectifier and its working
When the push button is in ‘released state’ then terminal ‘2’ is connected to terminal ‘3’, when push button is in ‘active or pressed’ then terminal ‘2’ is connected to terminal ‘1’.
The push button connected to diode 1 is ‘button 1’ and the other one is ‘button 2’.
When ‘button 1’ is pressed and ‘button 2’ is released then it is equivalent to first half wave of AC. In this state, diode 1 is forward biased, diode 2 is reverse biased and current flows through LED, through diode 1.
When ‘button 2’ is pressed and ‘button 1’ is released then it is equivalent to second half wave of AC. In this state, diode 1 is reverse biased, diode 2 is forward biased and current does flows through LED, through diode 2.
Uses of rectifiers
Write yourself
Conclusion
The output of full wave rectifier clearly shows that potential difference is stable, which shows that current is flowing in one direction during positive half and negative half cycles of AC. We are also able to measure potential difference across LED using DC voltmeter.
Sources of errors
Write yourself
Precautions
Keep away from high voltage current.
Bibliography
NCERT textbook of class 12
Physics by S.L.Arora
Circuits available on internet