(i) Explain with the help of a diagram the formation of depletion region and barrier potential in a pn junction.
(ii) Draw the circuit diagram of a half wave rectifier and explain its working.
Answers
Explanation:
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I) PN Junction :
In PN junction a P type and N type material are joined together.
As we know in P type the concetration of holes is more and in Ntype the concentration of electrons is more.
Hence there is a concentration gradient between P type and N type materials. Hence holes drift fro P side to N side by the process of diffusion due to concentration gardient. In the same way electrons will more from n side to P side
As a result the movement from P side leave ionised spaces [negative] on P side near junction Similarly a positive space charge is formed on the n side due to diffusion of electrons from n Side.
The two space charge regions on either side of junction is called Depletion region.
A potential difference is developed across the junction of 2 regions wich is known as Barrier potential.
II)Draw the circuit diagram of a half wave rectifier and explain its working.
When an alternative votage is appled across the diode in series with a load, a pulsating volatge will appear across the load only during the half cycle on the AC input during which the diode is forward biased.
In the positive half cycle of AC input, a current flows through load resistance RL and we get the output volatge.
In the negative half cycle, there is no output. Therefore the output voltage is restricted to only one direction and is said to be rectified.
